Please follow these steps to bind the dropdown list in asp.net
1. Open Visual Studio 2010
2.New Project
3.Asp.net Web Application
Design the Default page like this:-
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
<style type="text/css">
.style1
{
width: 100%;
}
.style2
{
width: 89px;
}
.style3
{
width: 89px;
height: 41px;
}
.style4
{
height: 41px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>
<table class="style1">
<tr>
<td class="style2">
<asp:Label ID="Label1" runat="server" Text="Please Select"></asp:Label>
</td>
<td>
<asp:DropDownList ID="DropDownList1" runat="server" Height="22px" Width="152px">
</asp:DropDownList>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click"
Text="Button" />
</td>
</tr>
<tr>
<td class="style3">
</td>
<td class="style4">
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
</td>
<td class="style4">
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
After that Code for the Default.aspx.cs file
using System;
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.Data;
namespace WebApplication1
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string connectionstring = "Data Source=PANKAJ-PC\\SQLEXPRESS2008;Initial Catalog=Data;User ID=sa;Password=sa2008";
SqlConnection con = new SqlConnection(connectionstring);
string com1="select * from pankaj";
SqlDataAdapter ad = new SqlDataAdapter(com1,con);
DataTable dt = new DataTable();
ad.Fill(dt);
DropDownList1.DataSource = dt;
DropDownList1.DataBind();
GridView1.DataSource = dt;
GridView1.DataBind();
DropDownList1.DataTextField = "Name";
DropDownList1.DataValueField = "Pid";
DropDownList1.DataBind();
Label2.Visible = false;
}
protected void Button1_Click(object sender, EventArgs e)
{
string connectionstring = "Data Source=PANKAJ-PC\\SQLEXPRESS2008;Initial Catalog=Data;User ID=sa;Password=sa2008";
SqlConnection conn = new SqlConnection(connectionstring);
SqlCommand com = new SqlCommand("select * from pankaj where pid='"+DropDownList1.SelectedValue+"'",conn);
SqlDataAdapter dt1 = new SqlDataAdapter(com);
DataSet ds = new DataSet();
dt1.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
Label2.Text = "Record Found According to Selection";
Label2.Visible = true;
}
}
}
Output will look like this..............................................
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