Example :-
WebForm1.aspx :-
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="_24_Select_Deselect.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:Button ID="Button2" runat="server" onclick="Button2_Click1"
Text="Select All" />
<asp:Button ID="Button3" runat="server" onclick="Button3_Click"
Text="Deselect All" />
<br />
<asp:CheckBoxList ID="CheckBoxList1" runat="server">
<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:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
<br />
</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 _24_Select_Deselect
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
CheckBoxList1.SelectedValue = "2"; //When the page is loaded Graduate will be selected using list item value
//CheckBoxList1.SelectedIndex = 0; //When the page is loaded Diploma will be selected using list item index
}
}
protected void Button1_Click(object sender, EventArgs e)
{
foreach (ListItem li in CheckBoxList1.Items)
{
if (li.Selected)
{
Response.Write(li.Text + ", ");
}
}
}
protected void Button2_Click1(object sender, EventArgs e)
{
foreach (ListItem li in CheckBoxList1.Items)
{
li.Selected = true;
}
}
protected void Button3_Click(object sender, EventArgs e)
{
foreach (ListItem li in CheckBoxList1.Items)
{
li.Selected = false;
}
}
}
}
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