CodeNumber是生成几位随机数
public static string GetCode(int CodeNumber)
int number;
char code;
string checkCode = String.Empty;
//System.Random random = new Random(unchecked((int)DateTime.Now.Ticks) + CodeNumber);
for (int i = 0; i < CodeNumber; i++)
{
System.Random random = new Random(GetRandomSeed());
number = random.Next();
code = (char)('0' + (char)(number % 10));
checkCode += code.ToString();
}
return checkCode;
}