Resolution Scale Convert

 private  double GetResolutionFromScale(double scale)

        {

            double dpi = 96; //Set to resolution of your screen

            double mapunitInMeters = 111319.5;

            double newRes = scale / (dpi * 39.37 * mapunitInMeters);

            return newRes;

        }

        private double GetScaleFromResolution(double resolution)

        {

            double dpi = 96; //Set to resolution of your screen

            double mapunitInMeters = 111319.5;

            double scale = resolution * dpi * 39.37 * mapunitInMeters;

            return scale;

        }