'How to access control from another thread? C#/WPF [duplicate]

How to change label in UserControl in UserControl from another thread?

Here is my code:

this.Dispatcher.Invoke(DispatcherPriority.Input,
                  new DelegateMethod(() => {
                    App.mainWindow.FirstUserControl.SecondUserControl.txtLbl.Content = "Hello!";
                  }));

Error:

System.InvalidOperationException: "The thread calling this cannot access the specified object because the object is owned by another thread."
c++sharpwpf


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