public partial class LoginClass : ViewController
{
    private static APICore api = new APICore();

    public LoginClass (IntPtr handle) : base (handle)
    {
    }


    public void LoginButtonClicked(UIButton sender)
    {
        LaunchLoginAPIAsync(sender);
    }


    private async void LaunchLoginAPIAsync(UIButton sender)
    {
        string name = Username.Text;
        string pass = Password.Text;

        UserLogin user = await api.Login(name, pass);

        if (user.isInvalidUsername())
        {
            //Create Alert
            var okAlertController = UIAlertController.Create("Error", " Invalid Username. Please try again with a correct username or register using the link below", UIAlertControllerStyle.Alert);
            //Add Action
            okAlertController.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));

            // Present Alert
           // PresentViewController(okAlertController, true, null);
        }
        else if (user.isWrongPassword())
        {
            //Create Alert
            var okAlertController = UIAlertController.Create("Error", "Invalid Password", UIAlertControllerStyle.Alert);
            //Add Action
            okAlertController.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
            // Present Alert
         //   PresentViewController(okAlertController, true, null);
        }
        else if (user.isLoginSuccessful())
        {
            // Create Alert
            var okAlertController = UIAlertController.Create("Logged in!", "Success", UIAlertControllerStyle.Alert);
            //Add Action
            okAlertController.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
      //      PresentViewController(okAlertController, true, null);


        }

    }
}