How to make an array of buttons a global variable?

1. The correct way: do not use global variables.
2. A bad way: to declare in any one class (which will be visible from the necessary methods) a static variable (or property) of the desired type.

As mentioned earlier, global variables are bad. But it all depends on how global they are, namely, what is the scope.

For example, we have a form class, inside which there are methods in which an array of buttons is needed, to which we periodically appeal, will look something like this:

public partial class MainWindow : Window { private Button[,] buttons; // может быть Button[]? public MainWindow() { InitializeComponent(); buttons = new Button[,] {...} // тут мы инициализируем наш массив (к примеру) } private void button_Click(object sender, RoutedEventArgs e) { // внутри метода мы как-то работаем с нашим массивом кнопок } private void button1_Click(object sender, RoutedEventArgs e) { // внутри метода мы как-то работаем с нашим массивом кнопок } } 

Gave a primitive example where buttons visible within the MainWindow . In this form, it still does not look as scary as it could be. Therefore, in your case it is necessary to choose the optimal scope of the variable .

And yet, in principle, you can write a method that will return you a list of buttons lying on a particular component, here is an example . Of course, this may not be suitable for solving your problem, but I dare to offer you as an example for your reference.

PS: Button[,] is a two-dimensional array (taken from your question), does it make sense to use the one-dimensional Button[] array?