Display related items in gridview when dropdownlist is selected

In this blog 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>

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"

            onselectedindexchanged="DropDownList1_SelectedIndexChanged">

        </asp:DropDownList><br />

        <asp:GridView ID="GridView1" runat="server">

        </asp:GridView>

    </div>

    </form>

</body>

</html>

 

 

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");

                con.Open();

                str = "select * from  employee";

                com = new SqlCommand(str, con);

 

                SqlDataReader reader = com.ExecuteReader();

                while (reader.Read())

                {

                    DropDownList1.Items.Add(reader["empid"].ToString());

                }

                reader.Close();

                con.Close();

            }

        }

 

        protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)

        {

            SqlConnection con = new SqlConnection(strConnString);

            con.Open();

            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;

            GridView1.DataBind();

            con.Close();

        }

    }

}

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