Here's the basics you can search for the nuances of the WindowsIdentity and
WindowsPrincipal classes. If this is for an ASP.NET application you can
access the user.Identity
Imports System.Security
Dim wi As New Principal.WindowsIdentity("userName")
Dim wp As New Principal.WindowsPrincipal(a)
If wp.IsInRole("domainName\groupName") Then
End If
