Dropdowm did not show the value of next one

Apr 19 2012 4:01 AM

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="list.aspx.cs" Inherits="list" %>

<!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>
<style type="text/css">
.style1
{
width: 100%;
}
.style2
{
width: 412px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div>

<table class="style1">
<tr>
<td class="style2">
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
onselectedindexchanged="DropDownList1_SelectedIndexChanged">
</asp:DropDownList>
</td>
<td>
 </td>
</tr>
<tr>
<td class="style2">
<asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="True"
onselectedindexchanged="DropDownList2_SelectedIndexChanged">
</asp:DropDownList>
</td>
<td>
 </td>
</tr>
<tr>
<td class="style2">
<asp:DropDownList ID="DropDownList3" runat="server" AutoPostBack="True">
</asp:DropDownList>
</td>
<td>
 </td>
</tr>
<tr>
<td class="style2">
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</td>
<td>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td class="style2">
 </td>
<td>
 </td>
</tr>
<tr>
<td class="style2">
 </td>
<td>
 </td>
</tr>
</table>

</div>
</form>
</body>
</html>

Coding
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;

public partial class list : System.Web.UI.Page
{

Class1 cls = new Class1();
DataSet ds = new DataSet();

protected void Page_Load(object sender, EventArgs e)
{

if (!IsPostBack)
{
sel();
}
}

private void sel()
{
DataSet ds = new DataSet();
ds = cls.getds("select State,StateId from State");
ListItem li = new ListItem();
li.Value = "0";
li.Text = "-Select-";
DropDownList1.Items.Add(li.ToString());

foreach (DataRow dr in ds.Tables[0].Rows)
{
ListItem li1 = new ListItem();
li1.Text = dr["State"].ToString();
DropDownList1.Items.Add(li1.ToString());

}

}

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList2.Items.Clear();
DataSet ds = new DataSet();
ds = cls.getds("select City,CityId from City where StateId='" + DropDownList1.SelectedIndex.ToString() + "'");
ListItem li3 = new ListItem();
li3.Value = "0";
DropDownList2.Items.Add(li3.ToString());
foreach (DataRow dr in ds.Tables[0].Rows)
{
ListItem li2 = new ListItem();
li2.Value = dr["CityId"].ToString();
li2.Text = dr["City"].ToString();
DropDownList2.Items.Add(li2.ToString());

}
}
protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
{
DropDownList3.Items.Clear();
DataSet ds = new DataSet();
ds = cls.getds("select Location,LocationId from Location where CityId='" + DropDownList2.SelectedIndex.ToString() + "'");
ListItem li7 = new ListItem();
li7.Text = "-select";
li7.Value = "0";
DropDownList3.Items.Add(li7.ToString());
foreach (DataRow dr in ds.Tables[0].Rows)
{
ListItem li8 = new ListItem();
li8.Value = dr["LocationId "].ToString();
li8.Text = dr["Location"].ToString();
DropDownList3.Items.Add(li8.ToString());

}
}
}

Answers (12)

Checkbox checked event in repeator

Session