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;
}