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gridview not display in the output page ?

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User-1026236167 posted

hello my gridview not display in the output page please solve this

cs

using System;
using System.Data;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;

namespace Store
{
public partial class WebForm5 : System.Web.UI.Page
{
SqlCommand cmd = new SqlCommand();
SqlConnection con = new SqlConnection();
string connection = System.Configuration.ConfigurationManager.AppSettings["con"].ToString();

public void EstablishConnection(string storeprocedure)
{
con.ConnectionString = connection;
cmd.Connection = con;
cmd.Connection.Open();
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = storeprocedure;
}

public void CloseConnection()
{
cmd.Connection.Close();
cmd.Connection.Dispose();
con.Close();
}

protected void Page_Load(object sender, EventArgs e)
{
FillGridview1();
}

public void FillGridview1()
{
SqlDataAdapter adp = new SqlDataAdapter(" select * from tbl_products", connection);
DataTable DT = new DataTable();
adp.Fill(DT);
for (int i = 0; i < GridView2.Rows.Count; i++)
{
try
{
((DropDownList)GridView2.Rows[i].FindControl("dd3")).DataSource = DT;
((DropDownList)GridView2.Rows[i].FindControl("dd3")).DataBind();
((DropDownList)GridView2.Rows[i].FindControl("dd3")).Items.Insert(0, new ListItem() { Text = "Select", Value = "0" });
}
catch { }
}

//dd3.DataSource = DT;
//dd3.DataBind();
//dd3.Items.Insert(0, new ListItem() { Text = "Select" });

}

protected void dd3_SelectedIndexChanged(object sender, EventArgs e)
{
foreach (GridViewRow gr in GridView2.Rows)
{
string benefit = "0";
TextBox tb = (TextBox)gr.FindControl("txt1");
benefit = ((tb.Text));

TextBox bn29 = ((TextBox)gr.FindControl("txt1"));
bn29.Text = benefit;

foreach (GridViewRow gr7 in GridView2.Rows)
{
string benefit7 = "0";
DropDownList tb7 = (DropDownList)gr7.FindControl("dd3");
benefit7 = ((tb7.Text));

DropDownList bn22 = ((DropDownList)gr7.FindControl("dd3"));
bn22.Text = benefit7;

bn29.Text = bn22.SelectedValue.ToString();
}
}
}

}
}

aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm5.aspx.cs" Inherits="Store.WebForm5" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView2" AutoGenerateColumns="false" runat="server" CellPadding="4"
ForeColor="#333333" GridLines="None" Width="186px">
<AlternatingRowStyle BackColor="White" />
<Columns>

<asp:TemplateField HeaderText="hello">
<ItemTemplate>
<asp:DropDownList runat="server" ID="dd3" Width="220px" Height="35px"
OnSelectedIndexChanged="dd3_SelectedIndexChanged" DataTextField="mrp"
DataValueField="mrp" AutoPostBack="true"></asp:DropDownList>
</ItemTemplate>
<ItemTemplate>
<asp:TextBox runat="server" ID="txt1" Width="220px" Height="35px" ></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="hello">

<ItemTemplate>

</ItemTemplate>
</asp:TemplateField>

</Columns>
<EditRowStyle BackColor="#2461BF" />
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
<RowStyle BackColor="#EFF3FB" />
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
<SortedAscendingCellStyle BackColor="#F5F7FB" />
<SortedAscendingHeaderStyle BackColor="#6D95E1" />
<SortedDescendingCellStyle BackColor="#E9EBEF" />
<SortedDescendingHeaderStyle BackColor="#4870BE" />
</asp:GridView>

</div>
</form>
</body>
</html>

Monday, August 24, 2020 5:48 AM

Answers

User-939850651 posted

Hi prabhjot1313.

I used the code you provided to create a simple example.

I found that you did not set a data source for the grid view, so the grid will not display any data on the page.

public void FillGridview1()
        {
            SqlDataAdapter adp = new SqlDataAdapter(" select * from tbl_products", connection);
            DataTable DT = new DataTable();
            adp.Fill(DT);
            GridView2.DataSource = DT;
            GridView2.DataBind();
            for (int i = 0; i < GridView2.Rows.Count; i++)
            {
                try
                {
                    ((DropDownList)GridView2.Rows[i].FindControl("dd3")).DataSource = DT;
                    ((DropDownList)GridView2.Rows[i].FindControl("dd3")).DataBind();
                    ((DropDownList)GridView2.Rows[i].FindControl("dd3")).Items.Insert(0, new ListItem() { Text = "Select", Value = "0" });
                }
                catch {
                //do something here
                }
            }
        }

Pelase bind data source to gridview before iterate the rows of the GridView.

On the other hand, I recommend that you could learn to use debugging tools.

Best regards,

Xudong Peng

Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM

Tuesday, August 25, 2020 8:52 AM

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gridview not display in the output page ?

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