</handlers>
</system.webServer>
利用AjaxBaseWebPart进行开发
编写使用该扩展的WebPart最简单的办法就是直接继承别人写好的AjaxBaseWebPart。下面是我用的一个。您也可以用其他的，或自己写一个。
下面是命名空间引用部分：
using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Serialization;
using System.Web.UI;
using Microsoft.SharePoint.WebPartPages;
using Microsoft.SharePoint.Utilities;
using System.Web.UI.WebControls;
using System.Drawing;
下面是AjaxBaseWebPart类的实现部分：
/// <summary>
/// A base class that implements all the functionality required to use ASP.net Ajax extensions inside WSS
/// </summary>
[XmlRoot(Namespace = "Deps.AjaxBaseWebpart")]
public abstract class AjaxBaseWebpart : Microsoft.SharePoint.WebPartPages.WebPart
{
/*
* The idea and the code behind this base web part was taken from Erics blog post at:
* http://www.capdes.com/2007/02/ajaxbasepart_easy_aspnet_20_aj.html
* This basically manages the presence and configuration of the ScriptManager
* which is required by ASP.net ajax extensions to handle postbacks, ect. This web part also includes
* a common method for handling errors.
*/
#region Declarations
private string _ValidationGroupId;
private ValidationSummary _ErrorContainer;
private ScriptManager _AjaxManager;
#endregion
#region Constructor
public AjaxBaseWebpart()
{
}
#endregion
#region Methods
/// <summary>
/// Used to provide a common way to display errors to the user of the current web part.
/// </summary>
/// <param name="message">Description of the error that occured.</param>
public void RegisterError(string message)
{