void DoClear() { var bls = new BLSales(); var str = bls.DeleteSalesInvDetail(txtinvoiceno.Text); if(str!="1") { XtraMessageBox.Show(str, "POS", MessageBoxButtons.OK, MessageBoxIcon.Error); } else { dsInventory1.SALESINVDETAIL.Clear(); gridControl1.ResetBindings(); } lblmutilpleprice.Visible = false; }