Convert latitude and longitude to DMS (degrees minutes seconds) format

LatLon2Dms.cs

public static class LatLon2Dms
    {
        public static string Convert(double lat, double lon)
        {
            return ConvertSingle(lat, true) + ", " + ConvertSingle(lon, false);
        }

        private static string ConvertSingle(double value, bool isLat)
        {
            double v = Math.Abs(value);

            int deg = (int)Math.Floor(v);
            int min = (int)Math.Floor((v - deg) * 60);
            int sec = (int)Math.Floor(3600 * (v - deg) - 60 * min);

            return $"{deg}° {min}' {sec}\" {GetSuffix(value, isLat)}";
        }

        private static char GetSuffix(double value, bool isLat)
        {
            bool isNegative = (Math.Sign(value) == -1);

            if (isLat)
            {
                if (isNegative)
                {
                    return 'S';
                } else
                {
                    return 'N';
                }
            } else
            {
                if (isNegative)
                {
                    return 'W';
                } else
                {
                    return 'E';
                }
            }
        }
    }