First Step:- Working with Database
Then Follow :-
Default7b.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default7b.aspx.cs"
Inherits="Database.Default7b" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="DropDownList1" runat="server"
DataSourceID="SqlDataSource1" DataTextField="FirstName" DataValueField="Phone"> </asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$
ConnectionStrings:ConnectionString %>" SelectCommand="SELECT * FROM
[Customer]"></asp:SqlDataSource>
</div>
<p>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Get Phone
No." BackColor="Lime" />
</p>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label> </form>
</body>
</html>
Default.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace Database
{
public partial class Default7b : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack == false)
{
string connStr =
ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
SqlConnection con = new SqlConnection(connStr);
SqlCommand cmd = new SqlCommand("Select Distinct FirstName from Customer", con);
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
DropDownList1.DataTextField = "FirstName";
DropDownList1.DataValueField = "Phone";
DropDownList1.DataBind();
reader.Close();
con.Close();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = "Your Phone Number is : "+DropDownList1.SelectedValue;
}
}
}
Output:-
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