private void GenPinCode() {    string[] _crabodistrict=new string[]{"350201","350202","350203","350204","350205","350206","350211","350205","350213"};    Random  rnd = new Random(System.DateTime.Now.Millisecond);    //PIN = District + Year(50-92) + Month(01-12) + Date(01-30) + Seq(001-600)     string _pinCode=string.Format("{0}19{1}{2:00}{3:00}{4:000}",_crabodistrict[rnd.Next(0,8)],rnd.Next(50,92),rnd.Next(1,12),rnd.Next(1,30),rnd.Next(1,600));      #region Verify       char[] _chrPinCode = _pinCode.ToCharArray(); //校验码字符值char[] _chrVerify=new char[]{‘1‘, ‘0‘, ‘X‘, ‘9‘, ‘8‘, ‘7‘, ‘6‘, ‘5‘, ‘4‘, ‘3‘, ‘2‘}; //i----表示号码字符从由至左包括校验码在内的位置序号；//ai----表示第i位置上的号码字符值；//Wi----示第i位置上的加权因子，其数值依据公式intWeight=2（n-1）(mod 11)计算得出。int[] _intWeight=new int[]{7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1}; int _craboWeight=0; for(int i=0;i<17;i++)//从1 到 17 位,18为要生成的验证码{ _craboWeight=_craboWeight+Convert.ToUInt16(_chrPinCode[i].ToString())*_intWeight[i]; } _craboWeight=_craboWeight%11; _pinCode+=_chrVerify[_craboWeight]; #endregion }