// 生成日期加 4 位随机数

private string cfbh()

{

    DateTime time = GetDateTime();

    string h = time.ToString("yyyyMMddHHmmss");

    Random rad = new Random();// 实例化随机数产生器 rad

    int value = rad.Next(1000, 10000);

    string str = value.ToString();

    h += str;

    return h;

}