private void loadGridView()
        {
            DocGiaBLL     docGiaBLL = new DocGiaBLL();
            List <DocGia> dsDocGia  = docGiaBLL.dsDocGia();

            gvDocGia_a.DataSource = dsDocGia;
            foreach (DocGia docGia in dsDocGia)
            {
                docGia.Anh = ResolveUrl(srcImage + docGia.Anh);
            }
            DataBind();
        }
        protected void btnTimKiem_Click(object sender, EventArgs e)
        {
            lblTK.Text = "";
            string ten = txtTimKiem.Text;

            if (ten.Length > 0)
            {
                DocGiaBLL     docGiaBLL = new DocGiaBLL();
                List <DocGia> dsDocGia  = docGiaBLL.dsDocGia("%" + ten.Trim() + "%");
                lblTK.Text            = "Kết quả tìm kiếm: " + dsDocGia.Count;
                gvDocGia_a.DataSource = dsDocGia;
                foreach (DocGia docGia in dsDocGia)
                {
                    docGia.Anh = ResolveUrl(srcImage + docGia.Anh);
                }
                DataBind();
            }
            else
            {
                loadGridView();
            }
        }