DropDown控件，該控件用於實現下拉列表控件的客戶端功能。
實例代碼如下：
<%...@ Page Language="C#" AutoEventWireup="true" CodeFile="DragPanelDemo.ASPx.cs"
Inherits="DragPanelDemo" %>
<%...@ Register Assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35"
Namespace="System.Web.UI" TagPrefix="ASP" %><%...@ Register Assembly="AjaxControlToolkit" Namespace="AJaxControlToolkit" TagPrefix="cc1" %><!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>無標題頁</title></head><body> <form id="form1" runat="server"> <div> <ASP:ScriptManager ID="ScriptManager1" runat="server"> </ASP:ScriptManager> <div > <ASP:Panel ID="Panel3" runat="server" Width="100%">
<ASP:Panel Border BorderWidth="2px" BorderColor="black" ID="Panel4" runat="server" Width="100%" Height="20px"> <div class="dragMe"> 拖動</div> </ASP:Panel> <ASP:Panel Border BackColor="#AFC5FE" ForeColor="Black" Font-Size="small" BorderWidth="2px" BorderColor="black" ID="Panel5" runat="server" Width="100%" Height="150px" > <p>移動控制板</p> </ASP:Panel> </ASP:Panel> <cc1:DragPanelExtender ID="DragPanelExtender1" runat="server"
TargetControlID="Panel3" DragHandleID="Panel4"> </cc1:DragPanelExtender> </div> </div> </form></body></Html>
