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();
            }
        }
        protected void btnTim_Click(object sender, EventArgs e)
        {
            DAO_Entity daoKH = new DAO_Entity();

            XuLy_TiepNhanDonHang control = new XuLy_TiepNhanDonHang();

            control.TimtenKH(txtTim.Text.Trim());

            List <DTOKhachHang> kqTim = daoKH.TimTheoTenKH(txtTim.Text.Trim());

            GridDSKH.DataSource = kqTim;
            GridDSKH.DataBind();
        }