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Display related items in gridview when dropdownlist is selected

Posted By:satyapriyanayak       Posted Date: April 24, 2014    Points: 40    Category: ASP.NET Controls    URL: http://www.dotnetspark.com  

In this Code Snippets we will know how to Display related items in gridview when dropdownlist is selected.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Dropdownlist_gridview._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:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
        </asp:DropDownList><br />
        <asp:GridView ID="GridView1" runat="server">

using System;
using System.Collections;
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;
namespace Dropdownlist_gridview
    public partial class _Default : System.Web.UI.Page
        string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        SqlCommand com;
        SqlDataAdapter sqlda;
        DataSet ds;
        string str;

        protected void Page_Load(object sender, EventArgs e)
            SqlConnection con = new SqlConnection(strConnString);
            if (!IsPostBack)
                DropDownList1.Items.Add("Choose Id");
                str = "select * from  employee";
                com = new SqlCommand(str, con);

                SqlDataReader reader = com.ExecuteReader();
                while (reader.Read())

        protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
            SqlConnection con = new SqlConnection(strConnString);
            str = "select * from employee where empid='" + DropDownList1.SelectedItem.Text + "'";
            com = new SqlCommand(str, con);
            sqlda = new SqlDataAdapter(str,con);
            ds = new DataSet();
            sqlda.Fill(ds, "employee");
            GridView1.DataMember = "employee";
            GridView1.DataSource = ds;


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