//假如虛擬目錄名為"Webtest"，先在項目中引用
//System.DirectoryServices.dll，再
using System.DirectoryServices;
protected System.DirectoryServices.DirectoryEntry dirroot;

DirectoryEntry newVirDir = dirroot.Children.Add("Webtest","IIsWebVirtualDir");
newVirDir.Invoke("AppCreate",true);
newVirDir.CommitChanges();
dirroot.CommitChanges();

//虛擬目錄的屬性較常用的有:AccessRead,AccessWrite,AccessExecute,AccessScript,DefaultDoc,EnableDefaultDoc,Path等
DirectoryEntry Dirport = dirroot.Children.Find("Webtest","IIsVirtualDir");
Dirport .Properties["AccessRead"][0] = true;

DirectoryEntry Dirport = dirroot.Children.Find("Webtest","IIsVirtualDir");
Dirport.Invoke("AppDelete",true);
dirroot.CommitChanges();

object[] part = new object[2];
part[0] = "IIsWebVirtualDir";
part[1] = "Webtest";
dirroot.Invoke("Delete",part);
dirroot.CommitChanges();