C# getting all colors from Color

I want to make a ComboBox filled with all the colors from System.Drawing.Color

But I can't seem to collect all the colors from that collection

I've already tried using a foreach to do the job like this:

foreach (Color clr in Color)
     {

     }

But all I get is an error.

So how can I loop trough all the colors?

Any help will be appreciated.