C# 登录页面 之前用了一年半都没错，最近报错了
这个项目是前人留下的，webform的，之前在客户那边用了一年半也完全没问题，最近发现登录不上去。输入了账户名和密码，单击登录后报错。
下面这个是登录button

<INPUT type="submit" id="Submit1" name="Submit1" value=" " runat="server" onserverclick="Submit1_ServerClick" style="border-style:none; background: url(images/登录.png); width: 66px; height: 26px; margin-top: 0px;">

下面这个Submit1_ServerClick

protected void Submit1_ServerClick(object sender, System.EventArgs e)

        {



           if (!Page.IsValid) return;



           string sql = "exec spLogon @LogonName,@LogonPwd";

           SqlParameter[] parameters ={

                        new SqlParameter("@LogonName", SqlDbType.NVarChar,15),

                      	new SqlParameter("@LogonPwd", SqlDbType.NVarChar,20)};

           parameters[0].Value = LogonID.Text.Trim();           

           parameters[1].Value = Password.Text;     

           SqlDataReader dr = null;

          try

          {

            dr = DbHelperSQL.ExecuteReader(sql,parameters);

            if (dr.Read())

            {

                int id=Convert.ToInt32(dr[0]);

                TorionRole role = (TorionRole)Convert.ToInt32(dr[1]);

                string realname = dr[2].ToString();

                var user = new TorionUser(){ID=id,Role = role,RealName=realname};

                Session["TorionHR:CurrentUser"] = user;

                //write cookies to client

                Response.Cookies["CookiesUser"].Value = Server.UrlEncode(LogonID.Text.Trim()); 

                Response.Cookies["CookiesUser"].Expires = DateTime.Today.AddDays(1d);

                FormsAuthentication.RedirectFromLoginPage("*", false);

            }

   &nb