How to call a variable in WPF?

Question

WPF

There is a variable i in the MainWindow class, I need to call this variable and change it in ShopWindow.
Made a reference to the MainWindow class ww = new MainWindow();
ww.i and does not see.
Where did I mess up? "Public Static" modifiers cost.

Answer 1

new MainWindow(), as you might guess, will create a NEW instance, and you need an existing one.
Either keep a reference to the main window, or pass it when creating ShopWindow.
And static there, in general, is not needed.