protected void Enter_Click(object sender, EventArgs e)

    {

        FormsAuthentication.Initialize(); 

        string name = Request.Form["name"].Trim();

        string pwd = Request.Form["pwd"].Trim();

        string yanzheng = Request.Form["yanzheng"].Trim();

        SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ToString());

        conn.Open();

        string sql = "select count(*) from userinfo where username='" + name + "' and userpwd='" + pwd + "'";

        SqlCommand cmd = new SqlCommand(sql, conn);

        int count = Convert.ToInt32(cmd.ExecuteScalar());

        if (string.Compare(Request.Cookies["CheckCode"].Value, yanzheng, true) != 0)

        {

            Response.Write("<script>alert('验证码输入不正确');location.href='../admin/login.aspx';</script>");

            Response.End();

        }

        else

        {

            if (count > 0)

            {

                



                FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(1,name,DateTime.Now,DateTime.Now.AddMinutes(30),true,//Roles,//用户所属的角色字符串 

                    FormsAuthentication.FormsCookiePath);

                //加密身份验证票据 

                string hash = FormsAuthentication.Encrypt(ticket);

                //创建要发送到客户端的cookie 

                HttpCookie mycookie = new HttpCookie(FormsAuthentication.FormsCookieName, hash);

                if (ticket.IsPersistent)

                {

                    mycookie.Expires = ticket.Expiration;

                }