public class MainActivity : Activity
{
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
SetContentView(Resource.Layout.Main);
EditText val1 = FindViewById<EditText>(Resource.Id.txtuser1);
EditText val2 = FindViewById<EditText>(Resource.Id.txtuser2);
名称“资源”并不在当前的背景下存在。