VB.net创建虚拟目录后写入权限怎样得到

Imports System
Imports System.DirectoryServices
Imports System.IO

Public Class test
Inherits System.Web.UI.Page

#Region " Web 窗体设计器生成的代码 "

'该调用是 Web 窗体设计器所必需的。
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.DirectoryEntry1 = New System.DirectoryServices.DirectoryEntry

End Sub
Protected WithEvents LinkButton1 As System.Web.UI.WebControls.LinkButton
Protected WithEvents DirectoryEntry1 As System.DirectoryServices.DirectoryEntry
Protected WithEvents TextBox1 As System.Web.UI.WebControls.TextBox
Protected WithEvents TextBox2 As System.Web.UI.WebControls.TextBox
Protected WithEvents Button1 As System.Web.UI.WebControls.Button

'注意: 以下占位符声明是 Web 窗体设计器所必需的。
'不要删除或移动它。
Private designerPlaceholderDeclaration As System.Object

Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: 此方法调用是 Web 窗体设计器所必需的
'不要使用代码编辑器修改它。
InitializeComponent()
End Sub

#End Region

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'在此处放置初始化页的用户代码
CriaDiretorioVirtual("sltt1", "1", "./Root", False)
End Sub

Function CriaDiretorioVirtual(ByVal vdirname As String, ByVal serverID As String, ByVal vdirPath As String, ByVal criaApplication As Boolean) As DirectoryEntry
Dim newvdir As System.DirectoryServices.DirectoryEntry
Dim root As DirectoryEntry
root = New DirectoryEntry("IIS://localhost/W3SVC/" + serverID + "/Root")
newvdir = root.Children.Add(vdirname, "IIsWebVirtualDir")
newvdir.Properties("Path")(0) = vdirPath
If criaApplication Then
newvdir.Invoke("AppCreate", True)
newvdir.Properties("AppFriendlyName")(0) = vdirname
newvdir.Properties("AppIsolated")(0) = 2
End If
newvdir.CommitChanges()
Return newvdir
End Function
End Class