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Problem:

Customer is developing a WPF application and would like to display a Windows Message Box that has a Yes and No button. How can the application tell which one of these buttons was pressed after returning?

The Message Box is being displayed as follows:

    invoke type System.Windows.MessageBox::Show("My Text", "My Caption",
         type System.Windows.MessageBoxButton::YesNo,
         type System.Windows.MessageBoxImage::Question,
         type System.Windows.MessageBoxResult::Yes,
         type System.Windows.MessageBoxOptions::RightAlign)

Resolution:

The result is returned from the Show method as type System.Windows.MessageBoxResult so you can just test for the result directly in a conditional statement like:

 
      evaluate type System.Windows.MessageBox::Show(
             "My Text",
             "My Caption",
              type System.Windows.MessageBoxButton::YesNo
              type System.Windows.MessageBoxImage::Question
              type System.Windows.MessageBoxResult::Yes
              type System.Windows.MessageBoxOptions::RightAlign)
          when type MessageBoxResult::Yes
               perform yes-processing
            when type MessageBoxResult::No
               perform no-processing
       end-evaluate
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