Show related data from one dropdownlist to another

Satyapriyanayak
Posted by Satyapriyanayak under ASP.NET category on | Points: 40 | Views : 977
We will know how to Show related data from one dropdownlist to another. 

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication13._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="drpVno" runat="server"
onselectedindexchanged="drpVno_SelectedIndexChanged"></asp:DropDownList><br />
<asp:DropDownList ID="drpEmpCode" runat="server"></asp:DropDownList><br />
<asp:DropDownList ID="drpDrCode" runat="server"></asp:DropDownList><br />
<asp:DropDownList ID="drpBrCode" runat="server"></asp:DropDownList><br />
<asp:DropDownList ID="drpPrps" runat="server"></asp:DropDownList>
</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 WebApplication13
{
public partial class _Default : System.Web.UI.Page
{
string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
string str;
SqlCommand com;

protected void Page_Load(object sender, EventArgs e)
{
drpVno.AutoPostBack = true;
SqlConnection con = new SqlConnection(strConnString);

if (!IsPostBack)
{
drpVno.Items.Add("Choose Vno");
con.Open();
str = "select * from tblalloc";
com = new SqlCommand(str, con);
SqlDataReader reader = com.ExecuteReader();
while (reader.Read())
{
drpVno.Items.Add(reader["Vno"].ToString());
}
reader.Close();
con.Close();
}
}

protected void drpVno_SelectedIndexChanged(object sender, EventArgs e)
{
clear();
SqlConnection con = new SqlConnection(strConnString);
con.Open();
str = "select * from tblalloc where Vno='" + drpVno.SelectedItem.Text + "'";
com = new SqlCommand(str, con);
SqlDataReader reader = com.ExecuteReader();
while (reader.Read())
{
drpEmpCode.Items.Add(reader["EmpCode"].ToString());
drpDrCode.Items.Add(reader["DrCode"].ToString());
drpBrCode.Items.Add(reader["BrCode"].ToString());
drpPrps.Items.Add(reader["Prps"].ToString());
}
reader.Close();
con.Close();
}
private void clear()
{
drpEmpCode.Items.Clear();
drpDrCode.Items.Clear();
drpBrCode.Items.Clear();
drpPrps.Items.Clear();
}
}
}

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