public List <WorksOn> getWorksOn(int pnr)
        {
            List <WorksOn> wo = new List <WorksOn>();

            //Set isolation level
            TransactionOptions ops = new TransactionOptions();

            ops.IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted;

            //Wrapp transaction
            using (TransactionScope trans = new TransactionScope(TransactionScopeOption.Required, ops))
            {
                try
                {
                    var result = db.getWorksOn(pnr);
                    wo = result.ToList();
                    db.SubmitChanges();
                    trans.Complete();
                }
                catch (SqlException e)
                {
                    MessageBox.Show(e.Message.ToString());
                }
                catch (TransactionAbortedException tab)
                {
                    MessageBox.Show(tab.Message.ToString());
                }
                catch (TransactionInDoubtException tib)
                {
                    MessageBox.Show(tib.Message.ToString());
                }
            }
            return(wo);
        }