void GetData(object sender, EventArgs e)
        {
            this.gridControl1.ItemsSource = new GanDB(); // lay bang rong dua vao
            tableView1.DeleteRow(0);
            gridControl1.ShowLoadingPanel = true;
            QLThuebaoDomainContext db = new QLThuebaoDomainContext();
            if (m_kt)
            {
                EntityQuery<rp_dsgan> Query = db.GetRp_dsganQuery();
                LoadOperation<rp_dsgan> LoadOp = db.Load(Query.OrderBy(p => p.ma_nvcs), LoadOp_Complete, null);
            }
            else
            {
                EntityQuery<rp_dsgan> Query = db.GetRp_dsganQuery();
                LoadOperation<rp_dsgan> LoadOp = db.Load(Query.OrderBy(p => p.ma_nvkt), LoadOp_Complete, null);
            }

        }