private List <PurchaseOrder> GetPOList()
{
PurchaseOrderDAL dal = new PurchaseOrderDAL();
var pos = dal.SearchPO(txtPurchaseId.Text,
Utility.GetSelectedText(ddlPurchaseStatus),
Utility.GetSelectedText(ddlOrdMan),
Utility.GetSelectedText(ddlMachMan),
Utility.GetSelectedText(ddlPurchaseMan),
Utility.GetSelectedText(ddlApplyPurchaseMan),
Utility.GetSelectedText(ddlMachTableMan),
Utility.GetSelectedText(ddlApproveMan),
!string.IsNullOrEmpty(txtBeginDate.Text) ? DateTime.Parse(txtBeginDate.Text) : DateTime.MinValue,
!string.IsNullOrEmpty(txtEndDate.Text) ? DateTime.Parse(txtEndDate.Text) : DateTime.MaxValue);
return(pos.ToList());
}