gridview "Invalid postback or callback argument" problem

Question

User836525179 posted

hi guys

i'm using gridview control to show user basket in my website, i add delete button in my gridview control,but when i click on delete button it show me "Invalid postback or callback argument." error , i searched this problem in google and find some resolves like add enableEventValidation="false" on top page but just error not displayed and delete button does not worked , i add delete codes in RowCommand i tried to trace my codes but i undrestand row command does not run when i click on delete button

plz help if you know what is problem

this is my codes:

                            <asp:GridView ID="grdBasket" CssClass="GridViewStyle" DataKeyNames="id" PageSize="5" runat="server" AllowPaging="True" AutoGenerateColumns="False" OnRowCommand="grdBasket_RowCommand">
                            <Columns>
                                <asp:TemplateField>                    
                                    <ItemTemplate>
                                        <asp:Image ID="Image1" runat="server" ImageUrl='<%#Eval("smallimg") %>' Height="77" />
                                    </ItemTemplate>
                                </asp:TemplateField>
                                <asp:TemplateField HeaderText="شرح کالا">                    
                                    <ItemTemplate>
                                        <a href='../../product/<%#Eval("articleID") %>/<%#Eval("postTitle") %>' target="_blank"><asp:Label ID="Label1" style="float:right;direction:rtl;text-align:right" runat="server" Text='<%#Eval("postTitle") %>'></asp:Label></a>
                                    </ItemTemplate>
                                </asp:TemplateField>
                                <asp:TemplateField HeaderText="قیمت کالا">                    
                                    <ItemTemplate>
                                        <asp:Label ID="lblPrice" runat="server" ForeColor="Green" Text='<%#Eval("price").ToString()+ " تومان" %>'></asp:Label> 
                                    </ItemTemplate>
                                </asp:TemplateField>
                                <asp:BoundField DataField="datetime" HeaderText="تاریخ"/>
                                <asp:TemplateField>                    
                                    <ItemTemplate>
                                        <asp:ImageButton ID="btnDelete" runat="server" style="cursor:pointer;" CommandName="delRow" CommandArgument='<%#Eval("id") %>' ToolTip="حذف این رکورد" 
                                        OnClientClick="return confirm('آیا مطمعن هستید؟')" ImageUrl="~/ucp_Content/img/Trash.png" />
                                    </ItemTemplate>
                                </asp:TemplateField>
                            </Columns>
                            <RowStyle CssClass="RowStyle" />
                            <EmptyDataRowStyle CssClass="EmptyRowStyle" />
                            <PagerStyle CssClass="PagerStyle" />
                            <SelectedRowStyle CssClass="SelectedRowStyle" />
                            <HeaderStyle CssClass="HeaderStyle" />
                            <EditRowStyle CssClass="EditRowStyle" />
                            <AlternatingRowStyle CssClass="AltRowStyle" />
                            </asp:GridView>

    protected void Page_Load(object sender, EventArgs e)
    {
        if(!IsPostBack)
        {
            check_user();
            add_to_basket();
            get_user_basket();
        }
    }

    protected void grdBasket_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        var md = new MYDBMS();
        var dt = new DataTable();
        var clsp = new CLS_Basket();

        long PID = 0;

        try
        {
            if (e.CommandName == "delRow")
            {
                PID = Convert.ToInt64(e.CommandArgument);
                clsp.RecID = PID;
                md.ExecuteSQL(clsp.CartPage_Delete_Basket());
                grdBasket.DataBind();
                ScriptManager.RegisterStartupScript(this, GetType(), "Alert", "alert('کالای مورد نظر از سبد خرید حذف شد.');", true);
            }
        }
        catch
        {

        }
    }

Answer 1

User2103319870 posted

but just error not displayed and delete button does not worked , i add delete codes in RowCommand i tried to trace my codes but i undrestand row command does not run when i click on delete button

Instead of using rowcommand to attach the click event of button, IMHO a better option to use click event of button directly like below

  <asp:TemplateField>
                    <ItemTemplate>
                        <asp:ImageButton ID="btnDelete" runat="server" Style="cursor: pointer;" CommandName="delRow" CommandArgument='<%#Eval("ID") %>' ToolTip="حذف این رکورد"
                            OnClientClick="return confirm('آیا مطمعن هستید؟')" ImageUrl="~/ucp_Content/img/Trash.png" OnClick="btnDelete_Click" />
                    </ItemTemplate>
                </asp:TemplateField>

Now in button click you can access the ID like below

  protected void btnDelete_Click(object sender, ImageClickEventArgs e)
        {
            //Get the image button
            ImageButton imgbtn = sender as ImageButton;
            long PID = 0;
            try
            {
                //Access the command argument from ImageButton
                PID = Convert.ToInt64(imgbtn.CommandArgument);
                clsp.RecID = PID;
                md.ExecuteSQL(clsp.CartPage_Delete_Basket());
                //You might need to fetch the data from database and rebind the grid again
                grdBasket.DataBind();
                ScriptManager.RegisterStartupScript(this, GetType(), "Alert", "alert('کالای مورد نظر از سبد خرید حذف شد.');", true);
            }
            catch
            {
                throw;
            }
        }

Answer 2

User836525179 posted

ty problem resolved but when i two times click on delete button, it work

first time click did not work

Answer 3

User1400794712 posted

Hi uniservice3,

ty problem resolved but when i two times click on delete button, it work

first time click did not work

You can add a breakpoint for the Click method to check if this method is executed correctly for the first time clicking.

Best Regards,

Daisy