C# Xamarin Timer Class Not Updating View

Answer 1

You are not on the UI thread as the Timer callback is on a background thread, use Device.BeginInvokeOnMainThread when updating UI elements in that case:

So when updating your label instance in the callback, do this:

Device.BeginInvokeOnMainThread(() => label.Text = "" +i;);

If I were to update the text and update another element, would I just place a , after label.Text = ""+1or would I have to have a whole other line replicated,

The parameter provided to BeginInvokeOnMainThread is an Action, so you can execute as much code as needed on the UI thread using just one "block":

Device.BeginInvokeOnMainThread(() =>
{
    ...;
    ...;
    ...;
});

Or:

void UIThreadAction()
{
    ...;
    ...;
    ...;
}
Device.BeginInvokeOnMainThread(UIThreadAction);