Error-Failed to load viewstate. I am using 2 gridview.

Question

User390265149 posted

I am using 2 gridview.

One gridview display list of employees and

other gridview is used for entry of education qualifications.

My application works successfully for displaying records of education qualification of employees.

When I click on an one employee in 1st gridview, it displays qualifications in 2nd gridview.

The problem occurs when I save qualification of 1 employee and display successful message in another form and then return to same form for entry of 2nd employee, it gives above mentioned error.

I have to run program every time for entry of qualifications of each employee. Presently my program is in developmental stage and I am checking my program for every data entry.

Note: This error comes after saving qualifications of any 1 employee and after clicking any command button.

Please consider my problem.

Answer 1

User-691209617 posted

One Simple solution for said problem is 

EnableViewState="false"

If above solution not works then I would suspect that the 

ViewState  error is being caused by code on the code-behind and is not being triggered by the GridView. Can your post the code-behind for your 

OnRow...methods and any Page_Load / Page_Init  code?

Answer 2

User390265149 posted

I added EnableViewState="false" in following line

<%@ Page Title="" Language="VB" MasterPageFile="~/Site.master" AutoEventWireup="false" CodeFile="PersonQualificationDetail.aspx.vb" EnableViewState="false" Inherits="PersonQualificationDetail" %>

After then on every clicking I am getting following error message.

Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

Answer 3

User390265149 posted

I am giving my code as below

<%@ Page Title="" Language="VB" MasterPageFile="~/Site.master" AutoEventWireup="false" CodeFile="PersonQualificationDetail.aspx.vb" EnableViewState="false" Inherits="PersonQualificationDetail" %>

<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" Runat="Server">
     <script type = "text/javascript">
         function Confirm() 
         {
             var confirm_value = document.createElement("INPUT");
             confirm_value.type = "hidden";
             confirm_value.name = "confirm_value";
             if (confirm("क्या आप इस क्वालिफिकेशन को डिलीट करना चाहते हैं?")) 
             {
                 confirm_value.value = "हाँ";
             }
             else 
             {
                 confirm_value.value = "नहीं";
             }
             document.forms[0].appendChild(confirm_value);
         }
    </script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" Runat="Server">
    <table style="width:100%">
      <tr>
        <td colspan="2"><center><h1>व्यक्ति का एजुकेशनल क्वालिफिकेशन</h1></center></td>
      </tr>
      <tr>
        <td>
          <table>
            <tr>
              <td>
                <asp:Label ID="EmployeeIDLabel" runat="server" Text=""></asp:Label>
                <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" AppendDataBoundItems="true" TabIndex="1" Width="200px" Height="20px">
                </asp:DropDownList>
              </td>
            </tr>
            <tr>
              <td>
                <asp:Label ID="PagingLabel" runat="server" Text="पेजिंग सुचना" Enabled="False" ></asp:Label>
                <asp:DropDownList ID="PageList" runat="server" AutoPostBack="true" Enabled="false" TabIndex="2" Width="100px">
                </asp:DropDownList>
                <asp:CheckBox ID="PagewiseCheckBox" runat="server" Text="पेज के हिसाब से" AutoPostBack="true" Enabled="false" TabIndex="3" />
              </td>
            </tr>
            <tr>
              <td>
                <hr />
                <asp:Label ID="GridViewTitleLabel" runat="server" Font-Bold="true"></asp:Label>
                <table cellpadding="1px" cellspacing="1px" >
                  <tr>
                    <td><asp:Label ID="Label1" runat="server" CssClass="HeaderStyle" Text="क्र.सं." Width="35px"></asp:Label></td>
                    <td><asp:Label ID="Label2" runat="server" CssClass="HeaderStyle" Text="कोड" Width="60px"></asp:Label></td>
                    <td><asp:Label ID="Label3" runat="server" CssClass="HeaderStyle" Text="नाम " Width="125px"></asp:Label></td>
                    <td><asp:Label ID="Label6" runat="server" CssClass="HeaderStyle" Text="जन्मदिन" Width="50px"></asp:Label></td>
                    <td><asp:Label ID="Label9" runat="server" ForeColor="White" Width="15px"></asp:Label></td>
                  </tr>
                </table>
                <asp:Panel ID="Panel1" runat="server" ScrollBars="Vertical" Height="265">
                  <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" PageSize="15" Font-Size="Smaller"
                            DataKeyNames="em_employeeid" RowStyle-VerticalAlign="Bottom" ShowHeader="false" OnRowCreated="GridView1_RowCreated">
                    <Columns>
                      <asp:TemplateField ItemStyle-Width="35px" ItemStyle-HorizontalAlign="Center">
                        <ItemTemplate>
                          <%# Container.DataItemIndex + 1%>
                        </ItemTemplate>
                      </asp:TemplateField>
                      <asp:ButtonField ButtonType="Link" DataTextField="em_employeeid" HeaderText="Employee ID" ItemStyle-Width="60px" ItemStyle-HorizontalAlign="Center" />
                      <asp:BoundField DataField="em_empname" HeaderText="Employee Name" ItemStyle-Width="125px" ItemStyle-HorizontalAlign="Left" />
                      <asp:BoundField DataField="em_birthdate" HeaderText="Date of Birth" ItemStyle-Width="50px" DataFormatString="{0:dd-MM-yyyy}" HtmlEncode="false" ItemStyle-HorizontalAlign="Left" />
                    </Columns>
                  </asp:GridView>
                </asp:Panel>
              </td>
            </tr>
          </table>
        </td>

        <td>
          <table>
            <tr>
              <td>
                <table>
                  <tr>
                    <td>
                      <table>
                        <tr>
                          <td>
                            <asp:Label ID="NameLabel" runat="server" Text="नाम" Width="90px"></asp:Label>
                          </td>
                          <td>:</td>
                          <td class="EditText">
                            <asp:Label ID="NameTextLabel" runat="server" Width="400px"></asp:Label>
                          </td>
                        </tr>
                      </table>
                    </td>
                  </tr>
                </table>
              </td>
            </tr>
            <tr>
              <td>
                <asp:Label ID="Label4" runat="server" Font-Bold="true"></asp:Label>
                <table cellpadding="1px" cellspacing="1px" >
                  <tr>
                    <td><asp:Label ID="Label18" runat="server" CssClass="HeaderStyle" Text="क्र.सं." Width="30px"></asp:Label></td>
                    <td><asp:Label ID="Label5" runat="server" CssClass="HeaderStyle" Text="से" Width="20px"></asp:Label></td>
                    <td><asp:Label ID="Label17" runat="server" CssClass="HeaderStyle" Text="चेंज" Width="40px"></asp:Label></td>
                    <td><asp:Label ID="Label7" runat="server" CssClass="HeaderStyle" Text="एजुकेशनल क्वालिफिकेशन" Width="150px"></asp:Label></td>
                    <td><asp:Label ID="Label8" runat="server" CssClass="HeaderStyle" Text="अन्य क्वालिफिकेशन" Width="150px"></asp:Label></td>
                    <td><asp:Label ID="Label10" runat="server" CssClass="HeaderStyle" Text="स्ट्रीम/सब्जेक्ट" Width="105px"></asp:Label></td>
                    <td><asp:Label ID="Label13" runat="server" CssClass="HeaderStyle" Text="बोर्ड/यूनिवर्सिटी" Width="175px"></asp:Label></td>
                    <td><asp:Label ID="Label14" runat="server" CssClass="HeaderStyle" Text="स्कूल/कॉलेज" Width="150px"></asp:Label></td>
                    <td><asp:Label ID="Label15" runat="server" CssClass="HeaderStyle" Text="पासिंग ईयर" Width="70px"></asp:Label></td>
                    <td><asp:Label ID="Label16" runat="server" CssClass="HeaderStyle" Text="परसेंटेज" Width="40px"></asp:Label></td>
                    <td><asp:Label ID="Label12" runat="server" CssClass="HeaderStyle" Text="डिलीट" Width="40px"></asp:Label></td>
                    <td><asp:Label ID="Label11" runat="server" ForeColor="White" Width="15px"></asp:Label></td>
                  </tr>
                </table>
                <asp:Panel ID="Panel2" runat="server" ScrollBars="Vertical" Height="150px">
                  <asp:GridView ID="QualificationGridView" runat="server" AutoGenerateColumns="false" ShowHeader="false" 
                                  RowStyle-VerticalAlign="Bottom" OnRowCreated="QualificationGridView_RowCreated" >
                    <Columns>
                      <asp:TemplateField ItemStyle-Width="30px" ItemStyle-HorizontalAlign="Center">
                        <ItemTemplate>
                          <%# Container.DataItemIndex + 1%>
                        </ItemTemplate>
                      </asp:TemplateField>
                      <asp:TemplateField HeaderText="Select" ItemStyle-Width="20px">
                        <ItemTemplate>
                          <center>
                            <asp:CheckBox ID="SelectCheckBox" runat="server" OnCheckedChanged="SelectCheckBox_CheckedChanged" AutoPostBack="true" TabIndex="4" />
                          </center>
                        </ItemTemplate>
                      </asp:TemplateField>
                      <asp:TemplateField HeaderText="EditCommand" ItemStyle-Width="40px">
                        <ItemTemplate>
                          <center>
                            <asp:Button ID="EditButton" runat="server" CommandName="Edit" Width="40px" Text="Edit" CommandArgument="<%# Container.DataItemIndex %>" />
                          </center>
                        </ItemTemplate>
                      </asp:TemplateField>
                      <asp:TemplateField HeaderText="Education Qualification" ItemStyle-Width="150px">
                        <ItemTemplate>
                          <asp:DropDownList ID="QualificationDropDownList" runat="server" AppendDataBoundItems="true" AutoPostBack="true"
                                            OnSelectedIndexChanged="QualificationDropDownList_SelectedIndexChanged" TabIndex="5" Width="145px">
                          </asp:DropDownList>
                        </ItemTemplate>
                      </asp:TemplateField>
                      <asp:TemplateField HeaderText="Other Qualification" ItemStyle-Width="150px" >
                        <ItemTemplate>
                          <asp:TextBox ID="OtherQualificationTextBox" runat="server" CssClass="CapitalText" MaxLength="20" Width="145px" Enabled="false" TabIndex="6"></asp:TextBox>
                        </ItemTemplate>
                      </asp:TemplateField>
                      <asp:TemplateField HeaderText="Stream/Subjects" ItemStyle-Width="105px" >
                        <ItemTemplate>
                          <asp:TextBox ID="StreamSubjectTextBox" runat="server" CssClass="CapitalText" MaxLength="50" Width="100px" Enabled="false" TabIndex="8"></asp:TextBox>
                        </ItemTemplate>
                      </asp:TemplateField>
                      <asp:TemplateField HeaderText="University/Board" ItemStyle-Width="175px" >
                        <ItemTemplate>
                          <asp:TextBox ID="UniversityBoardTextBox" runat="server" CssClass="CapitalText" MaxLength="100" Width="170px" Enabled="false" TabIndex="9"></asp:TextBox>
                        </ItemTemplate>
                      </asp:TemplateField>
                      <asp:TemplateField HeaderText="School/College" ItemStyle-Width="125px" >
                        <ItemTemplate>
                          <asp:TextBox ID="SchoolCollegeTextBox" runat="server" CssClass="CapitalText" MaxLength="100" Width="145px" Enabled="false" TabIndex="10"></asp:TextBox>
                        </ItemTemplate>
                      </asp:TemplateField>
                      <asp:TemplateField HeaderText="PassingYear" ItemStyle-Width="70px" >
                        <ItemTemplate>
                            <asp:TextBox ID="PassingYearTextBox" runat="server" CssClass="CapitalText" MaxLength="4" Width="67px" Enabled="false" TabIndex="11"></asp:TextBox>
                        </ItemTemplate>
                      </asp:TemplateField>
                      <asp:TemplateField HeaderText="Percentage" ItemStyle-Width="40px" >
                        <ItemTemplate>
                            <asp:TextBox ID="PercentageTextBox" runat="server" CssClass="CapitalText" MaxLength="10" Width="37px" Enabled="false" TabIndex="12"></asp:TextBox>
                        </ItemTemplate>
                      </asp:TemplateField>
                      <asp:TemplateField HeaderText="DeleteCommand" ItemStyle-Width="40px">
                        <ItemTemplate>
                          <center>
                            <asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Width="40px" Text="Del" CommandArgument="<%# Container.DataItemIndex %>" />
                          </center>
                        </ItemTemplate>
                      </asp:TemplateField>
                    </Columns>
                    <HeaderStyle CssClass="HeaderStyle" Height="20px" />
                  </asp:GridView>
                </asp:Panel>
              </td>
            </tr>
            <tr>
              <td colspan="6">
                <table>
                  <tr>
                    <td colspan="3">
                      <asp:Label ID="MessageLabel" runat="server" Text=""></asp:Label>
                    </td>
                  </tr>
                  <tr>
                    <td colspan="3">
                      <center>
                        <asp:Button ID="SaveButton" runat="server" Text="सेव" Width="80" TabIndex="23" />
                        <asp:Button ID="UpdateButton" runat="server" Text="अपडेट" Width="80" TabIndex="24" />
                        <asp:Button ID="CancelButton" runat="server" Text="कैंसिल" Width="80" TabIndex="25" />
                        <asp:Button ID="BackButton" runat="server" Text="बैक" Width="80" TabIndex="26" />
                      </center>
                    </td>
                  </tr>
                </table>
              </td>
            </tr>
          </table>
        </td>
      </tr>
    </table>

</asp:Content>

Imports System
Imports System.Data
Imports System.Data.OleDb
Imports WebService

Partial Class PersonQualificationDetail
    Inherits System.Web.UI.Page

    Dim strSQL As String
    Dim connString As String = ConfigurationSettings.AppSettings("connection1")
    Dim conn As New OleDbConnection(connString)
    Dim oleDbCommand As New OleDbCommand
    Dim webService As New WebService

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        Session("appName") = "PersonQualificationDetail.aspx"
        If Session("userID") = "" Then
            Response.Redirect("Default.aspx")
        Else
            If Not IsPostBack Then

                strSQL = "SELECT COUNT(*) FROM options WHERE firsttime = 'N'"
                Dim DT As New DataTable
                Try
                    Dim DA As New OleDbDataAdapter(strSQL, conn)
                    DA.Fill(DT)
                Catch ex As Exception
                    MessageLabel.CssClass = "ErrorMessage"
                    MessageLabel.Text = webService.DisplayExceptionDetails(ex)
                    Session("message1") = MessageLabel.Text
                    MesgBox()
                End Try
                If DT.Rows(0).Item(0) = 1 Then
                    Dim mpLogLabel As Label
                    Dim mpLogButton As Button

                    mpLogLabel = CType(Master.FindControl("LogLabel"), Label)
                    If Not mpLogLabel Is Nothing Then
                        mpLogLabel.Text = "Welcome " + Session("UserID").ToString
                    End If

                    mpLogButton = CType(Master.FindControl("LogButton"), Button)
                    If Not mpLogButton Is Nothing Then
                        mpLogButton.Text = "Log Out"
                    End If
                End If

                ClearValues()
                RefreshList()
                bindData()
                bindData1()
                findAndColorRowInGridView()
                disabledText()
                ChangeCommandStatus(1)
                If Session("pageWise").ToString <> "" Then
                    PagewiseCheckBox.Checked = Session("pageWise")
                    GridView1.AllowPaging = True
                    GridView1.PageIndex = Convert.ToInt32(Session("pagingInfo"))
                End If


                Session("keyValue") = "0"
                MessageLabel.CssClass = "SuccessMessage"
                MessageLabel.Text = "New Entry"

            End If
        End If

    End Sub

    Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged

        If DropDownList1.Text = "" Then
            clearValues()
            Session("keyValue") = ""
            ChangeCommandStatus(1)
        Else
            Session("keyValue") = DropDownList1.Text
            displayData(Session("keyValue"))
            ChangeCommandStatus(2)
        End If
        findAndColorRowInGridView()

    End Sub

    Protected Sub PageList_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles PageList.SelectedIndexChanged

        GridView1.PageIndex = Convert.ToInt32(PageList.SelectedValue)
        'Ye procedure gridview ka row ko yellow color karta hai jab type kiya hua text ko gridview me find kar leta hai.
        bindData()
        findAndColorRowInGridView()

    End Sub

    Protected Sub PagewiseCheckBox_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles PagewiseCheckBox.CheckedChanged

        If PagewiseCheckBox.Checked = True Then
            GridView1.AllowPaging = True
        Else
            GridView1.AllowPaging = False
        End If
        'Ye procedure gridview ka row ko yellow color karta hai jab type kiya hua text ko gridview me find kar leta hai.
        bindData()
        findAndColorRowInGridView()

    End Sub

    Protected Sub GridView1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView1.DataBound

        'Clear our all of the items in the Dropdownlist
        PageList.Items.Clear()

        'Add a ListItem for each page
        For i As Integer = 0 To GridView1.PageCount - 1
            Dim pageListItem As New ListItem(String.Concat("Page ", i + 1), i.ToString())
            PageList.Items.Add(pageListItem)

            'select the current item, if needed
            If i = GridView1.PageIndex Then
                pageListItem.Selected = True
            End If
        Next

    End Sub

    Protected Sub GridView1_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles GridView1.PageIndexChanging

        GridView1.PageIndex = Int32.Parse(e.NewPageIndex)
        bindData()
        'Ye procedure gridview ka row ko yellow color karta hai jab type kiya hua text ko gridview me find kar leta hai.
        findAndColorRowInGridView()

    End Sub

    Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand

        If e.CommandName = "" Then
            Dim currentRowIndex As Integer = Int32.Parse(e.CommandArgument.ToString())
            Dim keyValue As String = GridView1.DataKeys(currentRowIndex).Value
            Session("keyValue") = keyValue
            DropDownList1.Text = keyValue
            MessageLabel.Text = ""
            displayData(keyValue)

        End If

    End Sub

    Protected Sub GridView1_RowCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowCreated

        If e.Row.RowType = DataControlRowType.DataRow Then
            e.Row.Attributes.Add("onmouseover", "this.className='highlight'")
            e.Row.Attributes.Add("onmouseout", "this.className='normal'")
        End If

    End Sub

    Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound

        If e.Row.RowType = DataControlRowType.DataRow Then
            If GridView1.DataKeys(e.Row.RowIndex).Value.ToString <> "" Then
                strSQL = "SELECT em_personqualificationdetail FROM employees WHERE em_employeeid = '" + GridView1.DataKeys(e.Row.RowIndex).Value.ToString + "'"
                Dim DT As New DataTable
                Try
                    Dim DA As New OleDbDataAdapter(strSQL, conn)
                    DA.Fill(DT)
                Catch ex As Exception
                    MessageLabel.CssClass = "ErrorMessage"
                    MessageLabel.Text = webService.DisplayExceptionDetails(ex)
                    Session("message1") = MessageLabel.Text
                    MesgBox()
                End Try
                If DT.Rows.Count = 1 Then
                    If DT.Rows(0).Item(0).ToString = "Y" Then
                        e.Row.Cells(0).BackColor = Drawing.Color.LightPink
                        e.Row.Cells(1).BackColor = Drawing.Color.LightPink
                        e.Row.Cells(2).BackColor = Drawing.Color.LightPink
                        e.Row.Cells(3).BackColor = Drawing.Color.LightPink
                    End If
                End If
            End If
        End If

    End Sub

    Protected Sub QualificationGridView_RowCreated(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles QualificationGridView.RowCreated

        If e.Row.RowType = DataControlRowType.DataRow Then
            e.Row.Attributes.Add("onmouseover", "this.className='highlight'")
            e.Row.Attributes.Add("onmouseout", "this.className='normal'")
        End If

    End Sub

    Protected Sub QualificationGridView_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles QualificationGridView.RowDataBound

        For Each gvr As GridViewRow In QualificationGridView.Rows
            If gvr.RowType = DataControlRowType.DataRow Then
                Dim qualificationDropDownList As DropDownList = CType(gvr.Cells(2).FindControl("QualificationDropDownList"), DropDownList)

                'District List banaya
                strSQL = "SELECT qm_qualificationid, qm_qualificationname FROM qualificationmaster ORDER BY qm_qualificationid ASC"
                oleDbCommand.CommandType = CommandType.Text
                oleDbCommand.CommandText = strSQL
                oleDbCommand.Connection = conn
                qualificationDropDownList.Items.Clear()
                qualificationDropDownList.Items.Add(New ListItem("-Select-", ""))
                qualificationDropDownList.Items.Add(New ListItem("-Other-", "0"))
                Try
                    conn.Open()
                    qualificationDropDownList.DataSource = oleDbCommand.ExecuteReader()
                    qualificationDropDownList.DataTextField = "qm_qualificationname"
                    qualificationDropDownList.DataValueField = "qm_qualificationid"
                    qualificationDropDownList.DataBind()
                    conn.Close()
                Catch ex As Exception
                    MessageLabel.CssClass = "ErrorMessage"
                    MessageLabel.Text = webService.DisplayExceptionDetails(ex)
                    Session("message1") = MessageLabel.Text
                    MesgBox()
                End Try
            End If
        Next

    End Sub

    Protected Sub QualificationGridView_RowDeleting(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewDeleteEventArgs) Handles QualificationGridView.RowDeleting

        ' Command Argument Property में मौजूद rowindex का वैल्यू निकालें.
        QualificationGridView.EditIndex = e.RowIndex

        ' Rows collection में उस row को निकालें जिसमे button मौजूद है.
        Dim gvr As GridViewRow = QualificationGridView.Rows(e.RowIndex)

        Dim selectCheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
        Dim qualificationDropDownList As DropDownList = CType(gvr.Cells(3).FindControl("QualificationDropDownList"), DropDownList)
        Dim otherqualificationTextBox As TextBox = CType(gvr.Cells(4).FindControl("OtherQualificationTextBox"), TextBox)
        'Dim streamsubjectTextBox As TextBox = CType(gvr.Cells(5).FindControl("StreamSubjectTextBox"), TextBox)
        'Dim universityboardTextBox As TextBox = CType(gvr.Cells(6).FindControl("UniversityBoardTextBox"), TextBox)
        'Dim schoolcollegeTextBox As TextBox = CType(gvr.Cells(7).FindControl("SchoolCollegeTextBox"), TextBox)
        'Dim passingyearTextBox As TextBox = CType(gvr.Cells(8).FindControl("PassingYearTextBox"), TextBox)
        'Dim percentageTextBox As TextBox = CType(gvr.Cells(9).FindControl("PercentageTextBox"), TextBox)

        strSQL = "DELETE FROM employeequalification WHERE eq_employeeid = '" + Session("keyValue").ToString + "' AND eq_qualificationid = '" + qualificationDropDownList.Text + "' AND eq_otherqualification = '" + otherqualificationTextBox.Text + "'"
        Try
            conn.Open()
            oleDbCommand = New OleDbCommand(strSQL, conn)
            oleDbCommand.ExecuteNonQuery()
            conn.Close()
        Catch ex As Exception
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = webService.DisplayExceptionDetails(ex)
            Session("message1") = MessageLabel.Text
            MesgBox()
        End Try

        strSQL = "SELECT eq_employeeid FROM employeequalification WHERE eq_employeeid = '" + Session("keyValue").ToString + "'"
        Dim DT As New DataTable
        Try
            Dim DA As New OleDbDataAdapter(strSQL, conn)
            DA.Fill(DT)
        Catch ex As Exception
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = webService.DisplayExceptionDetails(ex)
            Session("message1") = MessageLabel.Text
            MesgBox()
        End Try

        '
        If DT.Rows.Count = 0 Then
            'employees टेबल में em_personqualificationdetail फील्ड का वैल्यू  'N' करना हैं.
            strSQL = "UPDATE employees SET em_personqualificationdetail = 'N' WHERE em_employeeid = '" + Session("keyValue").ToString + "'"
            Try
                conn.Open()
                oleDbCommand = New OleDbCommand(strSQL, conn)
                oleDbCommand.ExecuteNonQuery()
                conn.Close()
            Catch ex As Exception
                MessageLabel.CssClass = "ErrorMessage"
                MessageLabel.Text = webService.DisplayExceptionDetails(ex)
                Session("message1") = MessageLabel.Text
                MesgBox()
            End Try
        End If
        displayData(Session("keyValue").ToString)

    End Sub

    Protected Sub QualificationGridView_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles QualificationGridView.RowEditing

        ' rowindex का वैल्यू निकालें.
        QualificationGridView.EditIndex = e.NewEditIndex

        ' Rows collection में उस row को निकालें जिसमे button मौजूद है.
        Dim gvr As GridViewRow = QualificationGridView.Rows(e.NewEditIndex)

        ' सारे textbox और dropdownlist को enable कर दें ताकि अपडेट कर सकें.
        Dim selectCheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
        Dim qualificationDropDownList As DropDownList = CType(gvr.Cells(3).FindControl("QualificationDropDownList"), DropDownList)
        Dim otherqualificationTextBox As TextBox = CType(gvr.Cells(4).FindControl("OtherQualificationTextBox"), TextBox)
        Dim streamsubjectTextBox As TextBox = CType(gvr.Cells(5).FindControl("StreamSubjectTextBox"), TextBox)
        Dim universityboardTextBox As TextBox = CType(gvr.Cells(6).FindControl("UniversityBoardTextBox"), TextBox)
        Dim schoolcollegeTextBox As TextBox = CType(gvr.Cells(7).FindControl("SchoolCollegeTextBox"), TextBox)
        Dim passingyearTextBox As TextBox = CType(gvr.Cells(8).FindControl("PassingYearTextBox"), TextBox)
        Dim percentageTextBox As TextBox = CType(gvr.Cells(9).FindControl("PercentageTextBox"), TextBox)
        If selectCheckBox.Checked Then
            qualificationDropDownList.Enabled = True
            otherqualificationTextBox.Enabled = False
            streamsubjectTextBox.Enabled = True
            universityboardTextBox.Enabled = True
            schoolcollegeTextBox.Enabled = True
            passingyearTextBox.Enabled = True
            percentageTextBox.Enabled = True
        End If

    End Sub

    Public Sub SelectCheckBox_CheckedChanged()

        'Is button ka istemaal cancel command ko enable/disable karne ke vaste 
        Dim buttonValue As Integer = 0

        For Each gvr As GridViewRow In QualificationGridView.Rows
            If gvr.RowType = DataControlRowType.DataRow Then
                Dim selectCheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
                Dim qualificationDropDownList As DropDownList = CType(gvr.Cells(3).FindControl("QualificationDropDownList"), DropDownList)
                Dim otherqualificationTextBox As TextBox = CType(gvr.Cells(4).FindControl("OtherQualificationTextBox"), TextBox)
                Dim streamsubjectTextBox As TextBox = CType(gvr.Cells(5).FindControl("StreamSubjectTextBox"), TextBox)
                Dim universityboardTextBox As TextBox = CType(gvr.Cells(6).FindControl("UniversityBoardTextBox"), TextBox)
                Dim schoolcollegeTextBox As TextBox = CType(gvr.Cells(7).FindControl("SchoolCollegeTextBox"), TextBox)
                Dim passingyearTextBox As TextBox = CType(gvr.Cells(8).FindControl("PassingYearTextBox"), TextBox)
                Dim percentageTextBox As TextBox = CType(gvr.Cells(9).FindControl("PercentageTextBox"), TextBox)
                If selectCheckBox.Checked Then
                    qualificationDropDownList.Enabled = True
                    otherqualificationTextBox.Enabled = False
                    streamsubjectTextBox.Enabled = True
                    universityboardTextBox.Enabled = True
                    schoolcollegeTextBox.Enabled = True
                    passingyearTextBox.Enabled = True
                    percentageTextBox.Enabled = True
                    buttonValue = buttonValue + 1
                Else
                    If buttonValue = gvr.RowIndex Then
                        selectCheckBox.Enabled = True
                    Else
                        selectCheckBox.Enabled = False
                    End If
                    qualificationDropDownList.Enabled = False
                    qualificationDropDownList.SelectedValue = ""
                    otherqualificationTextBox.Enabled = False
                    streamsubjectTextBox.Enabled = False
                    universityboardTextBox.Enabled = False
                    schoolcollegeTextBox.Enabled = False
                    passingyearTextBox.Enabled = False
                    percentageTextBox.Enabled = False
                End If
            End If
        Next

        If buttonValue = 0 Then
            CancelButton.Enabled = False
        Else
            CancelButton.Enabled = True
        End If

    End Sub

    Public Sub QualificationDropDownList_SelectedIndexChanged()

        'Is button ka istemaal save command ko enable/disable karne ke liye
        Dim buttonValue As Integer = 0
        Dim varQualification As String

        For Each gvr As GridViewRow In QualificationGridView.Rows
            If gvr.RowType = DataControlRowType.DataRow Then
                Dim selectCheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
                Dim qualificationDropDownList As DropDownList = DirectCast(gvr.FindControl("QualificationDropDownList"), DropDownList)
                Dim otherqualificationTextBox As TextBox = DirectCast(gvr.FindControl("OtherQualificationTextBox"), TextBox)

                'Enable/Disable otherqualificationtextbox
                If selectCheckBox.Checked Then
                    If qualificationDropDownList.SelectedValue = "0" Then
                        otherqualificationTextBox.Enabled = True
                        otherqualificationTextBox.Focus()
                    Else
                        'यहाँ पर चेक करना है कि GRIDVIEW में क्वालिफिकेशन रिपीट तो नहीं हो रहा है.
                        varQualification = qualificationDropDownList.Text

                        'अगर क्वालिफिकेशन मेट्रिक से कम है तो gridview के उस row में सारे textbox को disable करना है.
                        Dim streamsubjectTextBox As TextBox = CType(gvr.Cells(5).FindControl("StreamSubjectTextBox"), TextBox)
                        Dim universityboardTextBox As TextBox = CType(gvr.Cells(6).FindControl("UniversityBoardTextBox"), TextBox)
                        Dim schoolcollegeTextBox As TextBox = CType(gvr.Cells(7).FindControl("SchoolCollegeTextBox"), TextBox)
                        Dim passingyearTextBox As TextBox = CType(gvr.Cells(8).FindControl("PassingYearTextBox"), TextBox)
                        Dim percentageTextBox As TextBox = CType(gvr.Cells(9).FindControl("PercentageTextBox"), TextBox)
                        If CInt(Mid(qualificationDropDownList.Text, 10, 1)) <= 2 Then
                            streamsubjectTextBox.Enabled = False
                            universityboardTextBox.Enabled = False
                            schoolcollegeTextBox.Enabled = False
                            passingyearTextBox.Enabled = False
                            percentageTextBox.Enabled = False
                        Else
                            streamsubjectTextBox.Enabled = True
                            universityboardTextBox.Enabled = True
                            schoolcollegeTextBox.Enabled = True
                            passingyearTextBox.Enabled = True
                            percentageTextBox.Enabled = True
                        End If
                        otherqualificationTextBox.Text = ""
                        otherqualificationTextBox.Enabled = False
                    End If
                Else
                    If qualificationDropDownList.Text = "" Then
                        otherqualificationTextBox.Text = ""
                        otherqualificationTextBox.Enabled = False
                    End If
                End If

                'Enable/Disable save command button
                If qualificationDropDownList.SelectedValue <> "" Then
                    buttonValue = buttonValue + 1
                End If

            End If
        Next

        If buttonValue = 0 Then
            SaveButton.Enabled = False
        Else
            SaveButton.Enabled = True
        End If

    End Sub

    Protected Sub SaveButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles SaveButton.Click

        Dim entryDate, empName, empNo As String

        entryDate = "'" + Now().ToShortDateString + "'"
        MessageLabel.Text = ""
        Session("message1") = ""
        Session("pageWise") = PagewiseCheckBox.Checked
        Session("pagingInfo") = PageList.Text

        'कर्मचारी का नाम को स्टोर करना है.
        strSQL = "SELECT em_empname FROM employees WHERE em_employeeid = '" + Session("keyValue").ToString + "'"
        Dim DT1 As New DataTable
        Try
            Dim DA As New OleDbDataAdapter(strSQL, conn)
            DA.Fill(DT1)
        Catch ex As Exception
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = webService.DisplayExceptionDetails(ex)
            Session("message1") = MessageLabel.Text
            MesgBox()
        End Try
        If DT1.Rows.Count = 1 Then
            empName = DT1.Rows(0).Item(0).ToString
        Else
            empName = ""
        End If

        'employees टेबल में em_personqualificationdetail फील्ड का वैल्यू  'Y' करना हैं.
        strSQL = "UPDATE employees SET em_personqualificationdetail = 'Y' WHERE em_employeeid = '" + Session("keyValue").ToString + "'"
        Try
            conn.Open()
            oleDbCommand = New OleDbCommand(strSQL, conn)
            oleDbCommand.ExecuteNonQuery()
            conn.Close()
        Catch ex As Exception
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = webService.DisplayExceptionDetails(ex)
            Session("message1") = MessageLabel.Text
            MesgBox()
        End Try

        'saving education details
        For Each gvr As GridViewRow In QualificationGridView.Rows
            If gvr.RowType = DataControlRowType.DataRow Then
                Dim selectCheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
                Dim qualificationDropDownList As DropDownList = CType(gvr.Cells(3).FindControl("QualificationDropDownList"), DropDownList)
                Dim otherqualificationTextBox As TextBox = CType(gvr.Cells(4).FindControl("OtherQualificationTextBox"), TextBox)
                Dim streamsubjectTextBox As TextBox = CType(gvr.Cells(5).FindControl("StreamSubjectTextBox"), TextBox)
                Dim universityboardTextBox As TextBox = CType(gvr.Cells(6).FindControl("UniversityBoardTextBox"), TextBox)
                Dim schoolcollegeTextBox As TextBox = CType(gvr.Cells(7).FindControl("SchoolCollegeTextBox"), TextBox)
                Dim passingyearTextBox As TextBox = CType(gvr.Cells(8).FindControl("PassingYearTextBox"), TextBox)
                Dim percentageTextBox As TextBox = CType(gvr.Cells(9).FindControl("PercentageTextBox"), TextBox)

                'Enable/Disable othertextbox
                If selectCheckBox.Checked Then
                    strSQL = "INSERT into employeequalification (eq_employeeid, eq_qualificationid, eq_otherqualification, eq_streamsubject, eq_universityboard, eq_schoolcollege, eq_passingyear, eq_percentdivision, eq_createdby, eq_createdate) VALUES ('" + Session("keyValue").ToString + "', '" + qualificationDropDownList.Text + "', '" + otherqualificationTextBox.Text.ToUpper + "', '" + streamsubjectTextBox.Text.ToUpper + "', '" + universityboardTextBox.Text.ToUpper + "', '" + schoolcollegeTextBox.Text.ToUpper + "', '" + passingyearTextBox.Text + "', '" + percentageTextBox.Text + "', '" + Session("userID").ToString + "', " + entryDate + ")"
                    Try
                        conn.Open()
                        oleDbCommand = New OleDbCommand(strSQL, conn)
                        oleDbCommand.ExecuteNonQuery()
                        conn.Close()
                    Catch ex As Exception
                        MessageLabel.CssClass = "ErrorMessage"
                        MessageLabel.Text = webService.DisplayExceptionDetails(ex)
                        Session("message1") = MessageLabel.Text
                        MesgBox()
                    End Try
                End If

            End If
        Next

        empNo = Session("keyValue").ToString
        Session("keyValue") = "0" 'Is session variable ko yahin par saaf karna matlab 0(zero) taki update ke check na kare.
        RefreshList()
        ChangeCommandStatus(1)
        ClearValues()
        disabledText()
        bindData()

        If Len(MessageLabel.Text) = 0 Then
            MessageLabel.CssClass = "SuccessMessage"
            MessageLabel.Text = "व्यक्ति " + empNo + " [" + empName + "] का एजुकेशनल डिटेल्स सफलतापूर्वक सेव कर लिया गया है."
            Session("message1") = MessageLabel.Text
            MesgBox()
        Else
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = "माफ़ कीजिये! व्यक्ति " + empNo + " [" + empName + "] का एजुकेशनल डिटेल्स सेव नहीं हो पाया है."
            Session("message1") = MessageLabel.Text
            MesgBox()
        End If

    End Sub

    Protected Sub UpdateButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles UpdateButton.Click

        Dim entryDate, empNo, empName As String

        entryDate = "'" + Now().ToShortDateString + "'"
        MessageLabel.Text = ""
        Session("message1") = ""
        Session("pageWise") = PagewiseCheckBox.Checked
        Session("pagingInfo") = PageList.Text

        'Employee name ko store karna hai.
        strSQL = "SELECT em_empname, em_personqualificationdetail FROM employees WHERE em_employeeid = '" + Session("keyValue").ToString + "'"
        Dim DT1 As New DataTable
        Try
            Dim DA As New OleDbDataAdapter(strSQL, conn)
            DA.Fill(DT1)
        Catch ex As Exception
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = webService.DisplayExceptionDetails(ex)
            Session("message1") = MessageLabel.Text
            MesgBox()
        End Try
        If DT1.Rows.Count = 1 Then
            empName = DT1.Rows(0).Item(0).ToString
        Else
            empName = ""
        End If

        'employee ka education equalification check karo, agar pahle se hai to update karo nahi to insert karo
        strSQL = "SELECT eq_employeeid, eq_qualificationid FROM employeequalification WHERE eq_employeeid = '" + Session("keyValue").ToString + "'"
        Dim DT As New DataTable
        Try
            Dim DA As New OleDbDataAdapter(strSQL, conn)
            DA.Fill(DT)
        Catch ex As Exception
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = webService.DisplayExceptionDetails(ex)
            Session("message1") = MessageLabel.Text
            MesgBox()
        End Try

        'Updating education details record.
        For Each gvr As GridViewRow In QualificationGridView.Rows
            If gvr.RowType = DataControlRowType.DataRow Then
                Dim selectCheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
                Dim qualificationDropDownList As DropDownList = CType(gvr.Cells(3).FindControl("QualificationDropDownList"), DropDownList)
                Dim otherqualificationTextBox As TextBox = CType(gvr.Cells(4).FindControl("OtherQualificationTextBox"), TextBox)
                Dim streamsubjectTextBox As TextBox = CType(gvr.Cells(5).FindControl("StreamSubjectTextBox"), TextBox)
                Dim universityboardTextBox As TextBox = CType(gvr.Cells(6).FindControl("UniversityBoardTextBox"), TextBox)
                Dim schoolcollegeTextBox As TextBox = CType(gvr.Cells(7).FindControl("SchoolCollegeTextBox"), TextBox)
                Dim passingyearTextBox As TextBox = CType(gvr.Cells(8).FindControl("PassingYearTextBox"), TextBox)
                Dim percentageTextBox As TextBox = CType(gvr.Cells(9).FindControl("PercentageTextBox"), TextBox)


                'Enable/Disable othertextbox
                If selectCheckBox.Checked Then
                    If DT.Rows.Count > 0 Then
                        Dim counter As Integer = 0
                        Do While counter < DT.Rows.Count
                            If DT.Rows(counter).Item(1).ToString = qualificationDropDownList.Text Then
                                strSQL = "UPDATE employeequalification SET eq_qualificationid = '" + qualificationDropDownList.Text + "', eq_otherqualification = '" + otherqualificationTextBox.Text.ToUpper + "', eq_streamsubject = '" + streamsubjectTextBox.Text.ToUpper + "', eq_universityboard = '" + universityboardTextBox.Text.ToUpper + "', eq_schoolcollege = '" + schoolcollegeTextBox.Text.ToUpper + "', eq_passingyear = '" + passingyearTextBox.Text + "', eq_percentdivision = '" + percentageTextBox.Text + "', eq_updatedby = '" + Session("userID").ToString + "', eq_updatedate = " + entryDate + " WHERE eq_employeeid = '" + Session("keyValue").ToString + "' AND eq_qualificationid = '" + qualificationDropDownList.Text + "'"
                                Try
                                    conn.Open()
                                    oleDbCommand = New OleDbCommand(strSQL, conn)
                                    oleDbCommand.ExecuteNonQuery()
                                    conn.Close()
                                Catch ex As Exception
                                    MessageLabel.CssClass = "ErrorMessage"
                                    MessageLabel.Text = webService.DisplayExceptionDetails(ex)
                                    Session("message1") = MessageLabel.Text
                                    MesgBox()
                                End Try
                                counter = DT.Rows.Count + 1
                            Else
                                counter = counter + 1
                            End If
                        Loop
                        If counter = DT.Rows.Count Then
                            strSQL = "INSERT into employeequalification (eq_employeeid, eq_qualificationid, eq_otherqualification, eq_streamsubject, eq_universityboard, eq_schoolcollege, eq_passingyear, eq_percentdivision, eq_createdby, eq_createdate) VALUES ('" + Session("keyValue").ToString + "', '" + qualificationDropDownList.Text + "', '" + otherqualificationTextBox.Text.ToUpper + "', '" + streamsubjectTextBox.Text.ToUpper + "', '" + universityboardTextBox.Text.ToUpper + "', '" + schoolcollegeTextBox.Text.ToUpper + "', '" + passingyearTextBox.Text + "', '" + percentageTextBox.Text + "', '" + Session("userID").ToString + "', " + entryDate + ")"
                            Try
                                conn.Open()
                                oleDbCommand = New OleDbCommand(strSQL, conn)
                                oleDbCommand.ExecuteNonQuery()
                                conn.Close()
                            Catch ex As Exception
                                MessageLabel.CssClass = "ErrorMessage"
                                MessageLabel.Text = webService.DisplayExceptionDetails(ex)
                                Session("message1") = MessageLabel.Text
                                MesgBox()
                            End Try
                        End If
                    End If
                End If

            End If
        Next

        empNo = Session("keyValue").ToString
        Session("keyValue") = "0" 'Is session variable ko yahin par saaf karna matlab 0(zero) taki update ke check na kare.
        RefreshList()
        ChangeCommandStatus(1)
        ClearValues()
        disabledText()
        bindData()


        If Len(MessageLabel.Text) = 0 Then
            MessageLabel.CssClass = "SuccessMessage"
            MessageLabel.Text = "व्यक्ति " + empNo + " [" + empName + "] का एजुकेशनल डिटेल्स सफलतापूर्वक अपडेट कर लिया गया है."
            Session("message1") = MessageLabel.Text
            MesgBox()
        Else
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = "माफ़ कीजिये! व्यक्ति " + empNo + " [" + empName + "] का एजुकेशनल डिटेल्स अपडेट नहीं हो पाया है."
            Session("message1") = MessageLabel.Text
            MesgBox()
        End If

    End Sub

    Protected Sub CancelButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles CancelButton.Click

        RefreshList()
        ChangeCommandStatus(1)
        ClearValues()
        disabledText()
        Session("keyValue") = "0"
        DropDownList1.Text = ""
        bindData()
        MessageLabel.CssClass = "SuccessMessage"
        MessageLabel.Text = "New Entry"

    End Sub

    Protected Sub BackButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles BackButton.Click

        ChangeCommandStatus(0)
        clearValues()
        Session("keyValue") = "0"
        Response.Redirect("Default.aspx")

    End Sub

    Sub displayData(ByVal keyValue As String)

        ClearValues()
        'extract name and flag for new or old data
        strSQL = "SELECT em_employeeid, em_empname, em_personqualificationdetail FROM employees WHERE em_employeeid = '" + keyValue + "'"
        Dim DT1 As New DataTable
        Try
            Dim DA As New OleDbDataAdapter(strSQL, conn)
            DA.Fill(DT1)
        Catch ex As Exception
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = webService.DisplayExceptionDetails(ex)
            Session("message1") = MessageLabel.Text
            MesgBox()
        End Try

        If DT1.Rows.Count = 1 Then
            NameTextLabel.Text = DT1.Rows(0).Item(1).ToString
            If DT1.Rows(0).Item(2).ToString = "" Then
                ChangeCommandStatus(1)  'Enable/disable command buttons
            Else
                ChangeCommandStatus(2)  'Enable/disable command buttons
            End If
        End If

        strSQL = "SELECT eq_employeeid, eq_qualificationid, eq_otherqualification, eq_streamsubject, eq_universityboard, eq_schoolcollege, eq_passingyear, eq_percentdivision FROM employeequalification WHERE eq_employeeid = '" + keyValue + "'"
        Dim DT As New DataTable
        Try
            Dim DA As New OleDbDataAdapter(strSQL, conn)
            DA.Fill(DT)
        Catch ex As Exception
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = webService.DisplayExceptionDetails(ex)
            Session("message1") = MessageLabel.Text
            MesgBox()
        End Try

        'Edit interface me data bharaa
        If DT.Rows.Count > 0 Then
            Dim counter As Integer = 0
            For Each gvr As GridViewRow In QualificationGridView.Rows
                If gvr.RowType = DataControlRowType.DataRow Then
                    If counter < DT.Rows.Count Then
                        Dim selectCheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
                        Dim editButton As Button = CType(gvr.Cells(2).FindControl("EditButton"), Button)
                        Dim qualificationDropDownList As DropDownList = CType(gvr.Cells(3).FindControl("QualificationDropDownList"), DropDownList)
                        Dim otherqualificationTextBox As TextBox = CType(gvr.Cells(4).FindControl("OtherQualificationTextBox"), TextBox)
                        Dim streamsubjectTextBox As TextBox = CType(gvr.Cells(5).FindControl("StreamSubjectTextBox"), TextBox)
                        Dim universityboardTextBox As TextBox = CType(gvr.Cells(6).FindControl("UniversityBoardTextBox"), TextBox)
                        Dim schoolcollegeTextBox As TextBox = CType(gvr.Cells(7).FindControl("SchoolCollegeTextBox"), TextBox)
                        Dim passingyearTextBox As TextBox = CType(gvr.Cells(8).FindControl("PassingYearTextBox"), TextBox)
                        Dim percentageTextBox As TextBox = CType(gvr.Cells(9).FindControl("PercentageTextBox"), TextBox)
                        Dim deleteButton As Button = CType(gvr.Cells(10).FindControl("DeleteButton"), Button)
                        qualificationDropDownList.Text = DT.Rows(counter).Item(1).ToString
                        otherqualificationTextBox.Text = DT.Rows(counter).Item(2).ToString
                        streamsubjectTextBox.Text = DT.Rows(counter).Item(3).ToString
                        universityboardTextBox.Text = DT.Rows(counter).Item(4).ToString
                        schoolcollegeTextBox.Text = DT.Rows(counter).Item(5).ToString
                        passingyearTextBox.Text = DT.Rows(counter).Item(6).ToString
                        percentageTextBox.Text = DT.Rows(counter).Item(7).ToString
                        selectCheckBox.Checked = True
                        selectCheckBox.Enabled = False
                        editButton.Enabled = True
                        deleteButton.Enabled = True
                        counter = counter + 1
                    End If

                End If
                Dim select1CheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
                If counter = gvr.RowIndex Then
                    select1CheckBox.Enabled = True
                Else
                    select1CheckBox.Enabled = False
                End If
            Next

        Else
            For Each gvr As GridViewRow In QualificationGridView.Rows
                Dim selectCheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
                If gvr.RowIndex = 0 Then
                    selectCheckBox.Enabled = True
                Else
                    selectCheckBox.Enabled = False
                End If
            Next
        End If

        'selected row ka color change karo.
        'Ye procedure gridview ka row ko yellow color karta hai jab type kiya hua text ko gridview me find kar leta hai.
        findAndColorRowInGridView()

    End Sub

    Private Sub bindData()

        strSQL = "SELECT em_employeeid, em_empname, em_birthdate FROM employees WHERE MID(em_employeeid,3,2) <>'00' ORDER BY em_employeeid ASC"
        Dim DT As New DataTable
        Try
            Dim DA As New OleDbDataAdapter(strSQL, conn)
            DA.Fill(DT)
        Catch ex As Exception
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = webService.DisplayExceptionDetails(ex)
            Session("message1") = MessageLabel.Text
            MesgBox()
        End Try
        If DT.Rows.Count > 0 Then
            If DT.Rows.Count > GridView1.PageSize Then
                PagingLabel.Enabled = True
                PageList.Enabled = True
                PagewiseCheckBox.Enabled = True
            Else
                PagingLabel.Enabled = False
                PageList.Enabled = False
                PagewiseCheckBox.Enabled = False
            End If
            GridView1.DataSource = DT
            GridView1.DataBind()
        Else
            GridView1.DataSource = Nothing
            GridView1.DataBind()
        End If

    End Sub

    Private Sub bindData1()

        strSQL = "SELECT qm_qualificationid, qm_qualificationname FROM qualificationmaster"
        Dim DT As New DataTable
        Try
            Dim DA As New OleDbDataAdapter(strSQL, conn)
            DA.Fill(DT)
        Catch ex As Exception
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = webService.DisplayExceptionDetails(ex)
            Session("message1") = MessageLabel.Text
            MesgBox()
        End Try
        If DT.Rows.Count > 0 Then
            QualificationGridView.DataSource = DT
            QualificationGridView.DataBind()
        Else
            QualificationGridView.DataSource = Nothing
            QualificationGridView.DataBind()
        End If

    End Sub

    Sub RefreshList()

        'List ko refresh kiya
        strSQL = "SELECT em_employeeid, em_empname FROM employees WHERE MID(em_employeeid,3,2) <>'00' ORDER BY em_empname ASC"
        oleDbCommand.CommandType = CommandType.Text
        oleDbCommand.CommandText = strSQL
        oleDbCommand.Connection = conn
        DropDownList1.Items.Clear()
        DropDownList1.Items.Add(New ListItem("-चुनें-", ""))
        Try
            conn.Open()
            DropDownList1.DataSource = oleDbCommand.ExecuteReader()
            DropDownList1.DataTextField = "em_empname"
            DropDownList1.DataValueField = "em_employeeid"
            DropDownList1.DataBind()
            conn.Close()
        Catch ex As Exception
            MessageLabel.CssClass = "ErrorMessage"
            MessageLabel.Text = webService.DisplayExceptionDetails(ex)
            Session("message1") = MessageLabel.Text
            MesgBox()
        End Try

    End Sub

    Private Sub ClearValues()

        NameTextLabel.Text = ""
        For Each gvr As GridViewRow In QualificationGridView.Rows
            If gvr.RowType = DataControlRowType.DataRow Then
                Dim selectCheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
                Dim editButton As Button = CType(gvr.Cells(2).FindControl("EditButton"), Button)
                Dim qualificationDropDownList As DropDownList = CType(gvr.Cells(3).FindControl("QualificationDropDownList"), DropDownList)
                Dim otherqualificationTextBox As TextBox = CType(gvr.Cells(4).FindControl("OtherQualificationTextBox"), TextBox)
                Dim streamsubjectTextBox As TextBox = CType(gvr.Cells(5).FindControl("StreamSubjectTextBox"), TextBox)
                Dim universityboardTextBox As TextBox = CType(gvr.Cells(6).FindControl("UniversityBoardTextBox"), TextBox)
                Dim schoolcollegeTextBox As TextBox = CType(gvr.Cells(7).FindControl("SchoolCollegeTextBox"), TextBox)
                Dim passingyearTextBox As TextBox = CType(gvr.Cells(8).FindControl("PassingYearTextBox"), TextBox)
                Dim percentageTextBox As TextBox = CType(gvr.Cells(9).FindControl("PercentageTextBox"), TextBox)
                Dim deleteButton As Button = CType(gvr.Cells(10).FindControl("DeleteButton"), Button)
                If selectCheckBox.Checked Then
                    selectCheckBox.Checked = False
                End If
                editButton.Enabled = False
                qualificationDropDownList.Enabled = False
                qualificationDropDownList.SelectedValue = ""
                otherqualificationTextBox.Enabled = False
                otherqualificationTextBox.Text = ""
                streamsubjectTextBox.Enabled = False
                streamsubjectTextBox.Text = ""
                universityboardTextBox.Enabled = False
                universityboardTextBox.Text = ""
                schoolcollegeTextBox.Enabled = False
                schoolcollegeTextBox.Text = ""
                passingyearTextBox.Enabled = False
                passingyearTextBox.Text = ""
                percentageTextBox.Enabled = False
                percentageTextBox.Text = ""
                deleteButton.Enabled = False
            End If
        Next

    End Sub

    Private Sub disabledText()

        NameTextLabel.Enabled = False
        For Each gvr As GridViewRow In QualificationGridView.Rows
            If gvr.RowType = DataControlRowType.DataRow Then
                Dim selectCheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
                Dim editButton As Button = CType(gvr.Cells(2).FindControl("EditButton"), Button)
                Dim qualificationDropDownList As DropDownList = CType(gvr.Cells(3).FindControl("QualificationDropDownList"), DropDownList)
                Dim otherqualificationTextBox As TextBox = CType(gvr.Cells(4).FindControl("OtherQualificationTextBox"), TextBox)
                Dim streamsubjectTextBox As TextBox = CType(gvr.Cells(5).FindControl("StreamSubjectTextBox"), TextBox)
                Dim universityboardTextBox As TextBox = CType(gvr.Cells(6).FindControl("UniversityBoardTextBox"), TextBox)
                Dim schoolcollegeTextBox As TextBox = CType(gvr.Cells(7).FindControl("SchoolCollegeTextBox"), TextBox)
                Dim passingyearTextBox As TextBox = CType(gvr.Cells(8).FindControl("PassingYearTextBox"), TextBox)
                Dim percentageTextBox As TextBox = CType(gvr.Cells(9).FindControl("PercentageTextBox"), TextBox)
                Dim deleteButton As Button = CType(gvr.Cells(10).FindControl("DeleteButton"), Button)
                If selectCheckBox.Checked Then
                    selectCheckBox.Checked = False
                End If
                selectCheckBox.Enabled = False
                editButton.Enabled = False
                qualificationDropDownList.Enabled = False
                qualificationDropDownList.SelectedValue = ""
                otherqualificationTextBox.Enabled = False
                otherqualificationTextBox.Text = ""
                streamsubjectTextBox.Enabled = False
                streamsubjectTextBox.Text = ""
                universityboardTextBox.Enabled = False
                universityboardTextBox.Text = ""
                schoolcollegeTextBox.Enabled = False
                schoolcollegeTextBox.Text = ""
                passingyearTextBox.Enabled = False
                passingyearTextBox.Text = ""
                percentageTextBox.Enabled = False
                percentageTextBox.Text = ""
                deleteButton.Enabled = False
            End If
        Next

    End Sub

    Private Sub enabledText()

        NameTextLabel.Enabled = True
        For Each gvr As GridViewRow In QualificationGridView.Rows
            If gvr.RowType = DataControlRowType.DataRow Then
                Dim selectCheckBox As CheckBox = CType(gvr.Cells(1).FindControl("SelectCheckBox"), CheckBox)
                If selectCheckBox.Checked Then
                    selectCheckBox.Checked = False
                End If
                selectCheckBox.Enabled = True
            End If
        Next

    End Sub

    Private Sub ChangeCommandStatus(ByVal saveStatus As Integer)

        If saveStatus = 1 Then
            SaveButton.Enabled = True
            UpdateButton.Enabled = False
            CancelButton.Enabled = True
        ElseIf saveStatus = 2 Then
            SaveButton.Enabled = False
            UpdateButton.Enabled = True
            CancelButton.Enabled = True
        Else
            SaveButton.Enabled = False
            UpdateButton.Enabled = False
            CancelButton.Enabled = False
        End If

    End Sub

    Sub findAndColorRowInGridView()

        'Ye procedure gridview ka row ko yellow color karta hai jab type kiya hua text ko gridview me find kar leta hai.
        For Each gvr As GridViewRow In GridView1.Rows
            Dim keyValue As LinkButton = DirectCast(gvr.Cells(1).Controls(0), LinkButton)
            If keyValue.Text = Session("keyValue") Then
                GridView1.Rows(gvr.RowIndex).BackColor = Drawing.Color.Yellow
            Else
                GridView1.Rows(gvr.RowIndex).BackColor = Drawing.Color.Transparent
            End If
        Next

    End Sub

    Private Sub MesgBox()

        Session("appName") = "PersonQualificationDetail.aspx"
        Response.Redirect("Message.aspx")

    End Sub

End Class

Answer 4

User-691209617 posted

You have code in you Page_Load event so add this 

if (!Page.IsPostBack)
{ //do something }

This error is thrown when you click on your command and the Page_load is being ran again, in a normal life cycle will be Page_Load -> Click on Command -> Page_Load (again) -> Process ItemCommand Event.

Also, add this

<%@ Page EnableEventValidation="false" %>

Hope it helps.

Answer 5

User390265149 posted

My problem is solved with this option

<%@ Page EnableEventValidation="false" %>

I found a security note in using this option and suggested for use of  'RegisterForEventValidation'.

So how can I use this in place of 'EnableEventValidation="false"'

Answer 6

User-691209617 posted

Hi Vikas,

The problem is that ASP.NET does not get to know about this extra or removed listitem. You got an number of options (listed below):

• Disable eventvalidation (bad idea, because you lose a little of security that come with very little cost).
• Use ASP.NET Ajax UpdatePanel. (Put the listbox in the Updatepanel and trigger a update, if you add or remove listbox. This way viewstate and related fields get updates and eventvalidation will pass.)
• Forget client-side and use the classic postback and add or remove the listitems server-side

Please use update panel in your case and it will solve your problem. if you want I can send you some working example of update panel.

I hope this helps.

Answer 7

User390265149 posted

Thankyou sir. I like this answer.

Answer 8

User-691209617 posted

If that help then mark it as answer so it is beneficial for others too.