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;
        }