static public bool DeleteTaskChargeCode(DdTaskChargeCodeExt item, RevisionInfo revisionInfo)
    {
      DaTaskChargeCode da = new DaTaskChargeCode(DataStore.DbConnection);
      bool ok = da.DeleteById(item.Id);
      if (ok) AddChangeLog(da.TableName, item.Id, item.Timestamp, revisionInfo); //delete
	  return ok;
    }
 static public void UpdateTaskChargeCode(BindingSource binding, int taskHeadingRoleREF, RevisionInfo revInfo)
 {
   BindingList<DdTaskChargeCodeExt> list = (BindingList<DdTaskChargeCodeExt>)binding.DataSource;
   try
   {
     using (TransactionScope scope = new TransactionScope())
     {
     DaTaskChargeCode da = new DaTaskChargeCode(DataStore.CloneDbConnection());
     foreach (DdTaskChargeCodeExt item in list)
     {// do deletes first
       bool existing = da.GetById(item.Id);
       if (existing && item.DeleteFlag)
       {// delete here - avoid validation
         da.DeleteById(item.Id);
         AddChangeLog(da.TableName, item.Id, da.Timestamp, revInfo);  
       }
     }
     
     foreach (DdTaskChargeCodeExt item in list)
     {
       if (item.DeleteFlag) continue; // already done above
       //if (item.Id == string.Empty) continue; // already done above
       bool existing = da.GetById(item.Id);
       if (!existing)
       {
         da.Clear();
       }
       da.Description = item.Description;
       da.TaskChargeCodeID = item.TaskChargeCodeID;
       da.TaskHeadingRoleREF = item.TaskHeadingRoleREF;
       da.Title = item.Title;
       if (!existing)
       {
         da.TaskHeadingRoleREF = taskHeadingRoleREF;
         da.Insert();
         AddChangeLog(da.TableName, da.Id, da.Timestamp, revInfo); 
       }
       else
       {
         if (!da._IsModified) continue;
         da.Modified = DateTime.Now;
         da.ModifiedBy = Environment.UserName;
         da.Save();
         AddChangeLog(da.TableName, da.Id, da.Timestamp, revInfo);           }
     }
       scope.Complete();
     }
     binding.DataSource = GetTaskChargeCodeList(taskHeadingRoleREF);
   }
   catch (AppEx)
   {
     throw;
   }
   catch (Exception exc)
   {
     throw new AppEx(exc, "Error updating TaskChargeCode");
   }
 }