Question

I have a child window in Silverlight and I wish to send a string value to populate a text box in the applications MainPage.xaml.

How can I pass the value back?

I have tried this –

MainPage m = (MainPage)Application.Current.RootVisual;
m.textBox1.Text = value;

Answer 1

You should do this the other way around. The parent that opens the child window should attach an event handler to an event of the child, for example:

 childwindow.ButtonClicked += new EventHandler(childWindow_ButtonClicked);

Within this handler, the Parent can update its own Controls with values from properties of the child Window.

private void childWindow_ButtonClicked(object sender, EventArgs e)
      {
            txtValue.Text = childwindow.Value;
      }