Converting RGB colors to ARGB

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C#

Hi all,

I'm working alot with RGB and ARGB colors and
need to make an app to convert RGB color codes
to ARGB.

Please any help would be appriciated.

This is what I tried:

        byte Alpha;
        byte Red;
        byte Green;
        byte Blue;

        int RGB;
....

        private long ARGB()
        {
            long functionReturnValue = 0;
            if (Alpha > 127)
            {
                functionReturnValue = ((Alpha - 128) * 0x1000000 | 0x80000000) | Red | (Green * 0x100L) | (Blue * 0x10000);
            }
            else
            {
                functionReturnValue = (Alpha * 0x1000000) | Red | (Green * 0x100L) | (Blue * 0x10000);
            }
            return functionReturnValue;
            RGB = Alpha & Red & Green & Blue;
        }