public void Hien(string filter = "") { DataTable dt = new DataTable(); dt = ctpn.gettable(lbMaPN.Text); DataView dv = new DataView(dt); if (!string.IsNullOrEmpty(filter)) { dv.RowFilter = filter; } DGRDsanphamnhap.AutoGenerateColumns = false; DGRDsanphamnhap.DataSource = dv; }