Create Nice File Size in C#

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string CreateNiceFileSize(long size)
{
  int run = 0;
  double d = Convert.ToDouble(size);
  string[] sizes = {"B", "KB", "MB", "GB"};
            while (d >= 1024)
            {
                d /= 1024;
                run++;
            }

   double dou = Math.Round(d, 2);
   string sizestring = dou.ToString();
 
   return (sizestring+" "+sizes[run]);  
}