Hi. can u help me plz

I wont to display the combobox.selectedvalue from main wind in the combobox in secondary windows when it starts.

A code work but when I use this code WorkSpaceCombobox.ItemsSource = ds3.Tables[0].DefaultView; I don't get the value at the start in the secondary win.

code from main win

 

                        Window4 wnd = new Window4 ();

                         wnd.TextProperty = WorkspaceName.Text;