private void cboIssuedTo_EditValueChanged(object sender, EventArgs e) { if (cboIssuedTo.EditValue == null || cboStores.EditValue == null) return; IssueDoc iss = new IssueDoc(); DataTable dtRec = iss.GetTransactionByReceivingUnit(Convert.ToInt32(cboStores.EditValue), Convert.ToInt32(cboIssuedTo.EditValue)); gridIssues.DataSource = dtRec; }