protected void Page_Load(object sender, EventArgs e)
    {
        MemberService service = new MemberService();
        _userlogin = (Member)Session[SessionKey.USERLOGIN];

        if (!Page.IsPostBack) {
            List<Member> members = new List<Member>();
            members = service.loadAll();
            dgvmember.DataSource = members;
            dgvmember.DataBind();
        }
    }