protected void btnLogin_Click(object sender, EventArgs e)
        {
            try
            {
                User user = new User();
                user.EmailId = txtLogin.Text;
                user.Password = txtPassword.Text;

                UserService userService = new UserService();

                var loggedUser = userService.GetValidUser(user);

                if (loggedUser != null)
                {
                    Session["loggedUser"] = loggedUser;

                    Response.Redirect("UserList.aspx");
                }
                else
                {
                    lblInfo.Text = "Invalid credentials";
                }
            }
            catch (Exception ex)
            {
                lblInfo.Text = "Something went wrong..!!";
            }
        }