[Mono-list] Compile error - cannot find type 'Form'

[Andy Levine]

I just installed mono 0.17 from the RPMs (mono and mono-devel) on RH
7.1. I can successfully compile and run console applications, but any
class I try to compile that uses System.Windows.Forms gives me the
following error:

	SimpleHelloWorld.cs(15) error CS0246: Cannot find type `Form'
	Compilation failed: 1 error(s), 0 warnings

I have the simplest of classes (actually sample code form the .NET SDK),
shown below:
-----------------------------------------------------------------
	using System;
	using System.Windows.Forms;

	public class SimpleHelloWorld : Form {
	    [STAThread]
	    public static int Main(string[] args) {
	        Application.Run(new SimpleHelloWorld());
	        return 0;
	    }

	    public SimpleHelloWorld() {
	        this.Text = "Hello World";
	    }
	}
-------------------------------------------------------------------
I think I have everything I need. I found System.Windows.Forms.dll in
/usr/lib. I even ildasm'ed it from my Windows box and found all the
classes in there (including Form).

Any hints?

Thanks
Andy