System.Winforms has changed to System.Windows.Forms namespace back in Beta. Make sure you are referencing System.Windows.Forms.dll in the command line and System.Windows.Forms namespace in your code.

>I just installed the SDK, SP re-booted, tried to compile a C# example hello program.
>Receive error: 'System.Winforms.dll' could not be found
>
>Tried to load the same program in #Develop and received WinForms does not exist in the Class Namespace...

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Cathi Gero, CPA
Prenia Software & Consulting Services
Microsoft C# / .NET MVP
Mere Mortals for .NET MVP
cgero@prenia.com
www.prenia.com
Weblog: blogs.prenia.com/cathi