`MessageBox`, `SaveFileDialog` in .NET: which version should I use?

Question

Which one should I use and what are the differences:

System.Windows.MessageBox

System.Windows.Forms.MessageBox

The same question about System.Windows.Forms.SaveFileDialog and Microsoft.Win32.SaveFileDialog.

All I need is to show a message box and save file dialog (working on Windows XP as well).

Proper re-tagging is appreciated.

Thanks in advance, kh.

Answer 1

The controls in the System.Windows.Forms namespace are for WinForms applications. The controls in the System.Windows namespace are for WPF/Silverlight applications. So pick the controls that match your application type.