public class LoginDialogFrag : DialogFragment
    {

        public static LoginDialogFrag NewInstance(Bundle bundle)
        {
            LoginDialogFrag fragment = new LoginDialogFrag {Arguments = bundle};
            return fragment;
        }

        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            View view = inflater.Inflate(Resource.Layout.LoginDialog, container, false);

            Button loginBtn = view.FindViewById<Button>(Resource.Id.BtnLogin);
            var username = view.FindViewById<EditText>(Resource.Id.usernameTxt);
            var password = view.FindViewById<EditText>(Resource.Id.passwordTxt);

            loginBtn.Click += delegate
            {
                if (string.IsNullOrWhiteSpace(username.Text) || string.IsNullOrWhiteSpace(password.Text))
                {
                    ShowDialog("Please fill out all the fields!");
                    return;
                }
                CheckLogin(username.Text, password.Text);
            };
            return view;
        }

        private async void CheckLogin(string user, string pass)
        {
            //Checks the user http etc. then shows the Activity
            StartActivity(new Intent(Activity, typeof(LoginActivity)));
        }


        private void ShowDialog(string msg)
        {
            FragmentTransaction ft = FragmentManager.BeginTransaction();
            Fragment prev = FragmentManager.FindFragmentByTag("dialog");
            if (prev != null)
            {
                ft.Remove(prev);
            }

            ft.AddToBackStack(null);
            Fragment1 newFragment = Fragment1.NewInstance(null, msg);
            newFragment.Show(ft, "dialog");
        }
    }
}