Security VB.Net Tutorial

Imports System
Imports Microsoft.Win32
Imports System.Security.AccessControl
Imports System.Security.Principal
Public Class Example
    Public Shared Sub Main()
        Dim user As String = Environment.UserDomainName & "\" & Environment.UserName
        Dim mSec As New RegistrySecurity()
        Dim rule As New RegistryAccessRule(user,RegistryRights.ReadKey,AccessControlType.Allow)
        mSec.AddAccessRule(rule)
        rule = New RegistryAccessRule(user,RegistryRights.ChangePermissions,AccessControlType.Deny)
        mSec.AddAccessRule(rule)
        ShowSecurity(mSec)
        rule = New RegistryAccessRule(user,RegistryRights.WriteKey,AccessControlType.Allow)
        mSec.AddAccessRule(rule)
        ShowSecurity(mSec)
    End Sub 
    Private Shared Sub ShowSecurity(ByVal security As RegistrySecurity)
        Console.WriteLine(vbCrLf & "Current access rules:" & vbCrLf)
        For Each ar As RegistryAccessRule In security.GetAccessRules(True, True, GetType(NTAccount))
            Console.WriteLine("User: {0}", ar.IdentityReference)
            Console.WriteLine("Type: {0}", ar.AccessControlType)
            Console.WriteLine("Rights: {0}", ar.RegistryRights)
        Next
    End Sub
End Class