随机生成密码

 /// <summary>
    /// 随机生成密码
    /// </summary>
    /// <param name="pwdchars">密码备选字符</param>
    /// <param name="pwdlen">密码长度</param>
    /// <returns>密码</returns>
    public static string MakePassword(string pwdchars, int pwdlen)
    {
        string tmpstr = "";
        int iRandNum;
        Random rnd = new Random();
        for (int i = 0; i <pwdlen ; i++)
        {
            iRandNum = rnd.Next(pwdchars.Length);
            tmpstr += pwdchars[iRandNum];
        }
        return tmpstr;
    }