protected void btnLu_Click(object sender, EventArgs e)
        {
            
            DTONhacungcap dtoncc = new DTONhacungcap();
            dtoncc.TenNCC = txtTen.Text;
            dtoncc.Sdt = txtSDT.Text;
            dtoncc.Diachi = txtDiaChi.Text;

            DAO_Entity daoncc = new DAO_Entity();
             if (KiemTraNhap() == "")
            {
                daoncc.ThemNhaCungCap(dtoncc);
                Response.Redirect("~/QLBophan_Admin/QLCauHinhNCC/NCC.aspx");
            }
            else
            {
                ThemNCC.Visible = true;
                lbLoi.Text = KiemTraNhap();
            }
        }