int rosu=Color.red.getRGB() from Java to C#

Question

I am converting by hand a code from Java to C#, and I don't know how to convert

 private static int rosu = Color.Red.getRGB;

I get this error:

 'System.Drawing.Color' does not contain a definition for 'getRGB' and no extension method 'getRGB' accepting a first argument of type 'System.Drawing.Color' could be found (are you missing a using directive or an assembly reference?)

I use the declared "rosu" in this context:

       for (uy=0;uy<h;uy++)
            for (ux=0;ux<w;ux++)
                if(curba[uy][ux]==255)
                      curba[uy][ux]=rosu;

Thank you