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因为项目的要求，要做一个WEB service，通过传入用户名和新的密码，更新Windows帐号的密码，代码入下：

[WebMethod]
    public bool ChangePassword(string userName,string password,string validCode)
    {
        string msg = "";
        if (validCode != getOriginValidCode())
        {
            msg = "无效的BI确认码!";
            throw new Exception(msg);
           ;
        }
        string adPwd = System.Configuration.ConfigurationManager.AppSettings["adPwd"];
        string adUser = System.Configuration.ConfigurationManager.AppSettings["adUser"];
        DirectoryEntry myDirectoryEntry;
        myDirectoryEntry = new DirectoryEntry("WinNT://" + Environment.MachineName, adUser, adPwd);
        DirectoryEntry u = myDirectoryEntry.Children.Find(userName);
        if (null == u)
        {
            msg = "无效的用户";
            throw new Exception(msg);          
        }
        u.Invoke("setPassword", password);
        u.CommitChanges();
        if (msg != "")
        {
            throw new Exception(msg);
        }
        return true;
    }

运行是发现有错误：

u.Invoke("setPassword", password);

一般性拒绝访问错误

我估计是权限的问题，在事件查看器里看了下，发现是以NT AUTHORITY\NETWORK SERVICE来执行操作的，导致权限不足，修改web.config文件，添加以下两行后解决：

<authentication mode="Windows"/>
<identity impersonate="true" userName="userName" password="password"/>

类型的技术文章：

http://www.cnblogs.com/Anper/archive/2009/03/24/1420405.html