protected void ButtonSubmit_Click(object sender, EventArgs e)
        {
            UserBusiness business = new UserBusiness();
            string account = this.TextBoxUsername.Text;
            string password = this.TextBoxPassword.Text;

            User user = business.Login(account, password);

            if ((user != null) && (user.Authentication))
            {
                this.Session[Constant.SESSION_KEY_USER] = user;
                this.Response.Redirect(string.Format("{0}Manages/Defaults/About.aspx", EnvironmentalMonitor.Support.Resource.Variable.VirtualRootPath));
            }
        }