DoLogin.cs

private void DoLogin(MobileServiceAuthenticationProvider provider)
{
	var task = this.client.LoginAsync(this, provider).ContinueWith(t => {
		MobileServiceUser user = t.Result;

		this.BeginInvokeOnMainThread(() => {
			UIAlertView alert = new UIAlertView("Logged In!", string.Format ("Hello user {0}", user.UserId),
				                                    null, "OK");
			alert.Show ();
		});
	});
}