AdUsers.AdUserProvider.Validate C# (CSharp) Method

        public bool Validate(string login, string pass)
        {
            using (var context = new System.DirectoryServices.AccountManagement.PrincipalContext(ContextType.Domain, DOMAIN, null, null))
            {

                //Username and password for authentication.
                return context.ValidateCredentials(login, pass);
            }
        }