C# uses Xamarin to develop applications -- switching activities

Usually each Activity corresponds to 1 Layout. Specify the layout during onCreate (otherwise it still refers to the main layout), and then call startActivity:

protected override void OnCreate (Bundle bundle)
		{
			SetContentView (Resource.Layout.UserRegister);
			base.OnCreate (bundle);


			// Create your application here
			var btnBack =  FindViewById (Resource.Id.btnUserRgst_Back);
			btnBack.Click += (object sender, EventArgs e) => {
				StartActivity(typeof(MainActivity));
			};
		}

If you want to pass Value, you can use intent:

var intent = new Intent(this, typeof(UserRegister));
				StartActivity(intent);

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