// By using the ColorTranslator you can easily convert color values
// definied in the hexadecimal format (like it is used in HTML)
Color Color1 = System.Drawing.ColorTranslator.FromHtml("#EEEEEE");
Color Color2 = System.Drawing.ColorTranslator.FromHtml("red");
 
/*
** Convert back:
*/
 
string Color1a = System.Drawing.ColorTranslator.ToHtml(Color1);
// --> "#EEEEEE"
 
string Color2a = System.Drawing.ColorTranslator.ToHtml(Color2);
// --> "Red"
 
string Color2b = String.Format("#{0:X2}{1:X2}{2:X2}", Color2.R, Color2.G, Color2.B);
// --> "#FF0000"
//该代码片段来自于: http://www.sharejs.com/codes/csharp/1926