.net - Enums of colors -

my idea switch between colors, don't have use multiple pens can declare one.

i'm not sure have understood how enums work, please correct me:

type colortype =   | red = color.red   | green = color.green   | blue = color.blue

and wish use in:

let p = new pen(colortype.[index]) g.drawrectangle(p, 0, 0, 10, 10)

where index int variable (0 2) i'll use switch colors. problem can't declare enum, color not accepted. possible solutions?

to access colors index, put them in array:

let colors =   [|     color.red     color.green     color.blue   |]  let p = new pen(colors.[index]) g.drawrectangle(p, 0, 0, 10, 10)

EXC