How do get rid of this resource id error on Xamarin Android? - xamarin.android

Question

I am new to Xamarin android. I keep getting this error and have no idea how to get rid of it.
Error CS0117 'Resource.Id' does not contain a definition for 'button_1'
This is the code I'm using. The code works when I add a breakpoint to the Button button21 line but I keep getting an error in my visual studio editor. I am trying to use button click to navigate to another page.
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
Xamarin.Essentials.Platform.Init(this, savedInstanceState);
// Set our view from the "main" layout resource
SetContentView(Resource.Layout.activity_main);
Button button21 = FindViewById<Button>(Resource.Id.button_1);
button21.Click += Button_Click;
}
private void Button_Click(object sender, EventArgs e)
{
SetContentView(Resource.Layout.layout1);
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:minWidth="25px"
android:minHeight="25px">
<Button
android:text="Next"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/button_1" />
</LinearLayout>