Ajax CollapsiblePanelExtender in Asp.Net:There are the following easy steps to understand how to use Ajax CollapsiblePanelExtender control in Asp.Net.Step 1: Create new Ajax enabled web site.Step 2: Now go to solution explorer and right click on root directory and click on Add reference then add AjaxControlTollkit.dll.Step 3: Copy the following code and paste on to your page.<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head id="Head1" runat="server"><title>CollapsiblePanel</title></head><body><form id="form1" runat="server"> <asp:ScriptManager runat="server" ID="scriptManager1" /> <div style="width: 410px; background: gray;"> <asp:Panel runat="server" ID="panel1"> <div style="font-weight: bold; background-color: ThreeDShadow;"> <table width="100%"> <tr> <td align="left">Clicking Here To view my profile <asp:Label runat="server" ID="textLabel" /> </td> <td align="right" width="10px"> <asp:Image ID="Image1" runat="server" /> </td> </tr> </table> </div> </asp:Panel> <asp:Panel runat="server" ID="panel2" Width="98%" HorizontalAlign="center"> <div> <table width="100%"> <tr valign="top"> <td align="left" width="100px"> <img src="myPhoto.jpg" /> </td> <td align="left">Hi<br />This is Purushottam rathore<br />Noida-201301<br />India </td> </tr> </table> </div> </asp:Panel> <ajaxToolkit:CollapsiblePanelExtender runat="server" ID="cpe" TargetControlID="panel2" CollapseControlID="panel1" ExpandControlID="panel1" Collapsed="true" CollapsedSize="0" ExpandedSize="120" ExpandedText="(Collapse...)" CollapsedText="(Expand...)" TextLabelID="textLabel" ImageControlID="Image1" ExpandedImage="Img/collapse.jpg" CollapsedImage="Img/expand.jpg"> </ajaxToolkit:CollapsiblePanelExtender></div></form></body></html>Step4: Now Debug the application by press F5,Output: you will get the following output:Figure 1:Click on the header or image (Right corner), you will see as follows:Figure 2:
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