c# check if the user member of a group?

Question

I have a code that I use to check if the user is member of the AD, worked perfectly,

now I want to add the possibility to check if the user also a member of a group!

Answer 1

This is not available on Windows XP or earlier.

Anyway, in order to check for group membership, you can use this code:

bool IsInGroup(string user, string group)
{
    using (var identity = new WindowsIdentity(user))
    {
        var principal = new WindowsPrincipal(identity);
        return principal.IsInRole(group);
    }
}