Transparent Color

[Froggy]

I was wondering...
How can i set a specific color as the trasnparent color, using the ColorKey struct in surfaces

I know that by default its black
and ive tried to put all kinds of values there but it seems like its black or nothing

help me plz
((Using DX9 with C#))

 

[AndreRyan]

ColorKey MyColKey;
MyColKey.ColorSpaceHighValue=Color.Orange.ToArgb;
MyColKey.ColorSpaceLowValue=Color.Orange.ToArgb;

MySurface.SetColorKey(ColorKeyFlags.SourceDraw, MyColKey);