验证码的比较

[align=left]

/// <summary>
/// 验证码的验证
/// </summary>
/// <param name="code">输入的验证码</param>
/// <returns>true,输入正确</returns>
public bool CheckCode()
        {
            try
            {
                string code = Request.Form["codes"].ToString();
                if (String.Compare(Session["CheckCode"].ToString(), code, true) != 0)
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
            catch (Exception)
            {

                return false;
            }

}


/// <summary>
/// 实现登录
/// </summary>
/// <param name="userName">用户名</param>
/// <param name="userPass">用户密码</param>
        public void checkLogin(string userName, string userPass)
        {
            string code = Request.Form["codes"].ToString();
            if (CheckCode(code) && userName != "")
            {
                //根据用户名获取用户信息(实体)
                UserInfo user = UserInfoManager.getUserInfo(userName);
                if (user.userPass == userPass)
                {
                    //保存用户名Cooies，30天
                    Response.Cookies["userName"].Value = user.userName;
                    Response.Cookies["userName"].Expires = DateTime.Now.AddDays(30);
                    //保存用户密码Cookies，30天
                    Response.Cookies["userId"].Value = user.userId;
                    Response.Cookies["userId"].Expires = DateTime.Now.AddDays(30);
                    Response.Redirect("登记跳转的页面");
                }
                else
                {
                    Response.Write("用户名或密码错误!");
                }
            }
            else
            {
                Response.Write("验证码错误!");
            }
        }


/// <summary>
/// 实现退出
/// </summary>
        public void logout()
        {
            Request.Cookies["userName"].Expires = DateTime.Now.AddDays(-1);
            Request.Cookies["userId"].Expires = DateTime.Now.AddDays(-1);
            Response.Redirect("退出跳转的页面");
        }

[/align]

用户名:<input type="text" value="" id="user" name="use" />
密码:<input type="text" value="" id="pass" name="pass" />
验证码:<input type="text" value="" id="codes" name="codes" />