Updated on Kisan Patel
How to access WPF MainWindow controls from another window?
How to access one window’s control (richtextbox) from another window in wpf?
Application.Current contains a collection of all windows in you application, you can get the other window with a query such as
var window2 = Application.Current.Windows .Cast<Window>() .FirstOrDefault(window => window is Window2) as Window2;
and then you can reference the control from your code, as in
var richText = window2.MyRichTextBox;
For Example, if you want to access WPF MainWindow then use below code:
((MainWindow)System.Windows.Application.Current.MainWindow).TextBlock1.Text = "Setting Text from My Program";