Check whether current user is a member of an active directory group

Question

I need to check whether current user is a member of an active directory group. I started with getting the current user as below. Now I want to know how to check this CurrentUser is in active directory group "CustomGroup"

string CurrentUser = WindowsIdentity.GetCurrent().Name;

Answer 1

You can use the .NET 3.5 System.DirectoryServices.AccountManagement classes. See the MSDN article Managing Directory Security Principals in the .NET Framework 3.5 for details. You can use something like:

string CurrentUser = WindowsIdentity.GetCurrent().Name;

PrincipalContext context = new PrincipalContext(ContextType.Domain, "Domain");
UserPrincipal upUser = UserPrincipal.FindByIdentity(context, CurrentUser);
if(upUser != null)
{
    if (upUser.IsMemberOf(context, IdentityType.SamAccountName, "CustomGroup")) 
    {
        // The user belongs to the group
    }
}