static internal FileSize FromKB(long KO)
 {
     FileSize res = new FileSize();
     res.SizeInKB = KO;
     return res;
 }
 static public FileSize FromMB(double MO)
 {
     FileSize res = new FileSize();
     res.DoubleSizeInMB = MO;
     return res;
 }
 static public FileSize FromGB(long Go)
 {
     FileSize res = new FileSize();
     res.SizeInGB = Go;
     return res;
 }
 static public FileSize FromMB(long MO)
 {
     FileSize res = new FileSize();
     res.SizeInMB = MO;
     return res;
 }