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When selected any item from the dropdown list all records related to this will be displayed in a gri

Posted By:satyapriyanayak       Posted Date: October 31, 2013    Points: 40    Category: Visual Studio    URL: http://www.dotnetspark.com  

We will know when selected any item from the dropdown list all records related to this will be displayed in a grid view without refreshing the whole webpage.

Table Creation

Create table Contacts (id varchar(50),name varchar(50),city varchar(50))

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_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>Untitled Page</title>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
        <asp:UpdatePanel ID="up1" runat="server">
           <ContentTemplate >
           <asp:Label ID="Label1" runat="server" Text="Choose Name" BackColor="#FFFF99"
                   ForeColor="Red" Width="100px"></asp:Label>
               <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
                   onselectedindexchanged="DropDownList1_SelectedIndexChanged" >

       <asp:AsyncPostBackTrigger ControlID ="DropDownList1" />
        <br />

  <asp:UpdatePanel ID="up2" runat="server">      
     <ContentTemplate >
    <asp:GridView ID="GridView1" runat="server">
     <Triggers >
      <asp:AsyncPostBackTrigger ControlID ="GridView1" />
        <br />

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
    string connStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
    SqlDataAdapter ad = new SqlDataAdapter();
    SqlCommand cmd = new SqlCommand();
    SqlDataAdapter sqlda;
    DataSet ds;
    string str;
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
        SqlConnection conn = new SqlConnection(connStr);
        str = "select * from Contacts where name like '" + DropDownList1.SelectedValue + "'";
        cmd = new SqlCommand(str, conn);
        sqlda = new SqlDataAdapter(cmd);
        ds = new DataSet();
        sqlda.Fill(ds, "Contacts");
        GridView1.DataSource = ds;
        GridView1.DataMember = "Contacts";
    protected void Page_Load(object sender, EventArgs e)
        SqlConnection con = new SqlConnection(connStr);
        if (!IsPostBack)
            DropDownList1.Items.Add("Choose name");
            str = "select name from Contacts";
            cmd = new SqlCommand(str, con);
            SqlDataReader reader = cmd.ExecuteReader();
            while (reader.Read())


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