C#控制IIS之拒绝访问问题

[中医程序猿]

我按如下方式去建虚拟目录：
// 获得IIS根目录
DirectoryEntry root = new DirectoryEntry("IIS://localhost/W3SVC/1/ROOT");
// 创建虚拟目录
DirectoryEntry myVD = root.Children.Add("testVD", "IISWebVirtualDir");
myVD.Invoke("AppCreate", true);
myVD.CommitChanges();
root.CommitChanges();

总是报
System.Runtime.InteropServices.COMException: 拒绝访问。

行59：DirectoryEntry myVD=root.Children.Add"testVD", "IISWebVirtualDir");

[COMException (0x80070005): 拒绝访问。]
System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail) +514
System.DirectoryServices.DirectoryEntry.Bind() +10
System.DirectoryServices.DirectoryEntry.get_IsContainer() +10
System.DirectoryServices.DirectoryEntries.CheckIsContainer() +14
System.DirectoryServices.DirectoryEntries.Add(String name, String schemaClassName) +14
IISWeb.IISWebMain.btnCreVD_Click(Object sender, EventArgs e) in c:\inetpub\wwwroot\iisweb\iiswebmain.aspx.cs:59
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain() +1263

各位大牛，救救我吧！！！

[潜水员2099]

帮你顶一下！！！

[cuike519]

http://support.microsoft.com/default.aspx?scid=kb;en-us;Q325791

[cuike519]

找了很多资料还是不知道怎么解决，你可以参考下面的（问题一样就是没有答案），希望高手可以只点一下！
http://www.c-sharpcorner.com/Code/2002/July/CreateVirtualDirs.asp
http://www.thecodeproject.com/csharp/virtualdir.asp?df=100&forumid=2334&exp=0&select=426084#xx426084xx
http://www.dotnet247.com/247reference/msgs/30/152092.aspx