产生验证码字符串 产生验证码 private string CheckCode() { charD allchar=new char{'0','1','2','3','4', 5,6,7,8,9,A,B',C,D,E,F,G, H,J,K,L,N",'O,P,Q,R',S, T,U,V,W,X,Y,Z} string checkstring=string.Empty; Random rnd=new Random(); for(inti=0;i<4;i++) checkstring+=""+allchar[rnd.Next(0,36)]; } return checkstring; 1313 产生验证码字符串 //产生验证码 private string CheckCode() { char[] allchar = new char[] { '0','1','2','3','4', '5','6','7','8','9','A','B','C','D','E','F','G', 'H','I','J','K','L','M','N','O','P','Q','R','S', 'T','U','V','W','X','Y','Z' }; string checkstring = string.Empty; Random rnd = new Random(); for (int i = 0; i < 4; i++) { checkstring += " "+allchar[ rnd.Next(0, 36) ]; } return checkstring; }