//Leng 随机数的子长 public string CreateRnd(int Leng)        {            string Ar1 = "A,B,C,D,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,U,V,W,X,Y,Z,0,1,2,3,4,5,6,7,8,9";            string[] ListAr = Ar1.Split(',');            Random RD = new Random();            int rnd = 0;            string strRnd = "";            for (int j = 1; j < Leng; j++)            {                rnd = RD.Next(0, ListAr.Length);                strRnd += ListAr[rnd];            }            return strRnd;        }