Working of Ajax

Hi,
you can use below code

Add the refernce in project  and in header section add below line for more info I attached the website code.
<%@ Register Assembly="AjaxControls" Namespace="AjaxControls" TagPrefix="asp" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

ASPX file

 
    
       
              
                                                                       
                                                                           
                                                                           
                                                                            Test
                                                                               
                                                                               
                                                                   
                                                                   
                                                                   
                                                                   
                                                                   
                                                                                                                                         ExpandedImage="~/Images/icon/DownArrow.gif" CollapsedImage="~/Images/icon/RightArrow.gif"
                                                                    ImageControlID="imgControlledFunction" SuppressPostBack="True" ExpandControlID="pnl1"
                                                                    Collapsed="false" CollapseControlID="pnl1">
                                                               
       
       

aspx.cs file

  protected void btnTest_OnClick(object sender, EventArgs e)
    {
        lbl.Text = "Button Click Event Fires..........";
    }

Hi,
i created a panel(say pnlClick) which has button,on click of it collapsible panel should work.
i placed my form which has a button inside an update panel which itself is inside one more panel say(pnlCollapsible) .and to the CollapsiblePanelExtender i specified CollapseControlId as pnlClick,targetcontrolid as pnlCollapsible.My problem is the button inside the form should work.I am not getting where the mistake is happening

Hi,
Before the colappsible panel use update panel

 
///Add the collapsible panel and form here