Xamarin工作室调试Android应用程序

Question

我已经构建它并且没有错误。但是当调试到我的Android设备（5.0棒棒糖）时，它会显示一个黑色屏幕大约1到2秒，然后返回主屏幕。这里有什么不对吗？

namespace myfirstapp
{
    [Activity (Label = "myfirstapp", MainLauncher = true, Icon = "@drawable/icon")]
    public class MainActivity : Activity
    {

        protected override void OnCreate (Bundle bundle)
        {
            base.OnCreate (bundle);

            // Set our view from the "main" layout resource
            SetContentView (Resource.Layout.Main);


            Button button = FindViewById<Button> (Resource.Id.btnAdd);

            button.Click += delegate {                
                EditText number1 = FindViewById<EditText>(Resource.Id.txtNum1);
                EditText number2 = FindViewById<EditText>(Resource.Id.txtNum2);
                TextView res = FindViewById<TextView>(Resource.Id.txtResult);
                int result =  Convert.ToInt32(number1.Text)+ Convert.ToInt32(number2.Text);
                res.Text = result.ToString();
            };
        }
    }
}