Using WinForms from a Console application

It is perfectly possible to use WinForms from a Console application.  You just need to add a Reference to System.Windows.Forms.  Thereafter, you can add any code that uses WinForms.  The only pitfall is that you need add the [STAThread] attribute to your Main method.  Otherwise, the OpenFileDialog instantiation will block/deadlock when running on Microsoft .net framework.  On Mono, everything runs fine without the [STAThread] attribute, but to eliminate portability issues, you probably want to add it.

[STAThread]

public static void Main (string[] args)
{
    OpenFileDialog openDialog = new OpenFileDialog ();
    openDialog.ShowDialog ();
}