Thanks Mikko
Yes, the FromRgb method works fine.
But, what is wrong with the Autodesk.AutoCAD.Colors.Color.FromColor( System.Drawing.Color) method.
My code is passes a System.Drawing.Color enumeration and I don't want to have to convert it to RGB.
it makes for really ugly code
Autodesk.AutoCAC.Colors.Color.FromRgb( System.Drawing.Color.Yellow.R, System.Drawing.Color.Yellow.G, System.Drawing.Color.Yellow.B )