public PackageInfo(String proofType)
        {
            this.PackageType = PackageTypeEnum.Letter;
            this.LetterInfo  = new LetterInfo(proofType);

            this.BoxInfo = null;
        }
 public PackageInfo(int h, int w, int d)
 {
     this.PackageType = PackageTypeEnum.Box;
     this.BoxInfo     = new BoxInfo(h, w, d);
     this.LetterInfo  = null;
 }