各位：
    我在制作登录&注册界面时，调试没有一错误；可填写用户名和密码，并点击确认按键后，出现如下错误：请指教，谢谢！
    登录页面源代码如下：
    public partial class CLogin : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        this.lblDate1.Text = DateTime.Now.ToString();
    }
    protected void btnLogin_Click(object sender, EventArgs e)
    {
        //从文件Web.config中读取连接字符串
        string strconn = ConfigurationSettings.AppSettings["dsn"];

        //连接本地计算机的HotelManageSys数据库
        SqlConnection cn = new SqlConnection(strconn);

        //构造SQL语句，检查CustomersInfo表中的用户名和密码是否正确
        string mysql = "select * from CustomersInfo where CCode='" + tbxCCode.Text + "'and CPassword='" + tbxCPwd.Text + "'";

        //创建SqlCommand对象
        SqlCommand cm = new SqlCommand(mysql, cn);

        cn.Open();
        int flag = (int)cm.ExecuteScalar();
        cn.Close();

        if (flag > 0)
        {
            lblMessage.Text = "";

            //保存当前用户名
            Session["CCode"] = tbxCCode.Text;
            lblMessage.Text = "欢迎您！" + Session["CCode"];
            Response.Redirect("CustomersInfo.aspx");
        }
        else
        {
            lblMessage.Text = "对不起，您的登录名称/登录密码不正确，请重新输入";
        }
    }

    protected void btnReg_Click(object sender, EventArgs e)
    {
        Response.Redirect("LReg.aspx");
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Redirect("LoadPass.aspx");
    }
}

谢谢，我试试

我是照书做的，是不是书印错了？