Как конвертировать количество byte в KB, MB, GB

private static readonly string[] _suffixes = { "bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };

public static string Convert(long value, int decimalPlaces = 1)
{
    if (decimalPlaces < 0) 
        throw new ArgumentOutOfRangeException("decimalPlaces"); 

    if (value < 0) 
        return "-" + SizeSuffix(-value); 

    if (value == 0) 
        return string.Format("{0:n" + decimalPlaces + "} bytes", 0); 

    // mag is 0 for bytes, 1 for KB, 2, for MB, etc.
    int mag = (int)Math.Log(value, 1024);

    // 1L << (mag * 10) == 2 ^ (10 * mag) 
    // [i.e. the number of bytes in the unit corresponding to mag]
    decimal adjustedSize = (decimal)value / (1L << (mag * 10));

    // make adjustment when the value is large enough that
    // it would round up to 1000 or more
    if (Math.Round(adjustedSize, decimalPlaces) >= 1000)
    {
        mag += 1;
        adjustedSize /= 1024;
    }

    return string.Format("{0:n" + decimalPlaces + "}{1}", adjustedSize, _suffixes[mag]);
}