protected void Page_Load(object sender, EventArgs e)
        {
            try
            {
                DTOKhachHang dto = new DTOKhachHang();
                DAO_Entity daokh = new DAO_Entity();

                XuLy_TiepNhanDonHang control = new XuLy_TiepNhanDonHang();
                control.LayDSKhachHang();

                List<DTOKhachHang> Dskh = daokh.TaoDSKH();
                GridDSKH.DataSource = Dskh;
                GridDSKH.DataBind();
            }
            catch (Exception)
            {

                Response.Write("<script>alert('Loi tai du lieu!')</script>");
            }
            ThemKH.Visible = false;


            if (IsPostBack == false)
            {
                List<DTOLoaiKH> dsLKH = new List<DTOLoaiKH>();
                DAO_Entity daoKH = new DAO_Entity();
                dsLKH = daoKH.LayDSLKH();
                //hien thi ten loai KH ra dropdownlist
                ddLoaiKH.DataTextField = "TenLKH";//TenLKH la thuoc tinh trong DTOLoaiKH
                //truyen dl theo ma loai 
                ddLoaiKH.DataValueField = "MaLKH";//MaLKH la thuoc tinh trong DTOLoaiKH
                ddLoaiKH.DataSource = dsLKH;
                ddLoaiKH.DataBind();
            }
        }