what does this code make?

Question

Hello,
today I wanted to learn xamarin, so I watched this video on https://docs.microsoft.com/de-de/xamarin/get-started/first-app/?pivots=win-vs2017, but I dont get the code at 3:34 - 3:53

this here:
((button)sender)

can someone please explain how this line works, and why it can't be written like in wpf like this:

xaml code:
<Button x:Name="hi" Clicked="Button_Clicked"/>

C# code:
private void Button_Clicked(object sender, EventArgs e)
{
count++;
hi.Content = count;

}

thanks for answers

Answer 1

I think a button with a dynamic caption indicating the count..
.🤔