hi my dear friends :

my ASPX code is like this :

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="AjaxManager.aspx.cs" Inherits="WebApplication1.AjaxManager" %> 

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

onselectedindexchanged="RadComboBox1_SelectedIndexChanged"> Value="RadComboBoxItem1" /> Value="RadComboBoxItem2" /> Value="RadComboBoxItem3" /> oncheckedchanged="CheckBox1_CheckedChanged" />

my c# - code behind code is like this :

using System; 

using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls;

namespace WebApplication1 { public partial class AjaxManager : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) {

    } 

    protected void CheckBox1_CheckedChanged(object sender, EventArgs e) 
    { 
        if (CheckBox1.Checked == true) 
        { 
            Response.Write("Hello Teleik! - This Is True Of CheckBox"); 
        } 
        if (CheckBox1.Checked == false) 
        { 
            Response.Write("Hello Teleik! - This Is false Of CheckBox"); 
        } 
    } 

    protected void RadComboBox1_SelectedIndexChanged(object o, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e) 
    { 
        if (RadComboBox1.SelectedIndex == 0) 
        { 
            CheckBox1.Checked = true; 
        } 
        if (RadComboBox1.SelectedIndex == 1) 
        { 
            CheckBox1.Checked = false; 
        } 
        if (RadComboBox1.SelectedIndex == 2) 
        { 
            CheckBox1.Checked = true; 
        } 
    } 
} 

}

at now my CheckBox1 CheckChanged Not work... when i click on checkbox1 it disappears or nothing happens... how can i Force CheckBox1 CheckChanged To Work? thanks for attention