MainActivity.CS

using Android.App;
using Android.Widget;
using Android.OS;
using Android.Content.Res;
using Android.Graphics.Drawables;

namespace spinnerPic
{
    [Activity(Label = "spinnerPic", 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);

            string username = "5";
            string password = "5";

            EditText txtUser = FindViewById<EditText>(Resource.Id.txtUser);
            EditText txtPass = FindViewById<EditText>(Resource.Id.txtPassword);
            Button btnLogin = FindViewById<Button>(Resource.Id.btnLogin);
            Button btnRegister = FindViewById<Button>(Resource.Id.btnRegister);


            btnRegister.Click += delegate {
                StartActivity(typeof(Registration));
            };

            btnLogin.Click += delegate {

                if (txtUser.Text == username && txtPass.Text == password) {
                    StartActivity(typeof(frmFeed));
                }
                else {
                    Toast.MakeText(this,"Login Failed",ToastLength.Long).Show();
                }
            };




        }
    }
}