Example :-
WebForm1.aspx :-
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="_26.WebForm1" %>
<!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></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:CheckBoxList ID="CheckBoxList1" runat="server"
RepeatDirection="Horizontal" AutoPostBack="True"
onselectedindexchanged="CheckBoxList1_SelectedIndexChanged">
<asp:ListItem Value="1">Diploma</asp:ListItem>
<asp:ListItem Value="2">Graduate</asp:ListItem>
<asp:ListItem Value="3">Post Graduate</asp:ListItem>
<asp:ListItem Value="4">Doctrate</asp:ListItem>
</asp:CheckBoxList>
<br />
<asp:ListBox ID="ListBox1" runat="server" Height="92px"
SelectionMode="Multiple" Width="110px"></asp:ListBox>
<br />
<br />
<asp:Label ID="Label1" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
WebForm1.aspx.cs :-
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace _26
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
{
ListBox1.Items.Clear();
foreach (ListItem li in CheckBoxList1.Items)
{
if (li.Selected)
{
ListBox1.Items.Add(li.Text);
}
}
if (CheckBoxList1.SelectedIndex == -1)
{
Label1.ForeColor = System.Drawing.Color.Red;
}
else
{
Label1.ForeColor = System.Drawing.Color.Black;
}
Label1.Text = ListBox1.Items.Count.ToString()+" items selected";
}
}
}
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