static public bool DeleteRequestItem(DdRequestItemExt item, RevisionInfo revisionInfo)
    {
      DaRequestItem da = new DaRequestItem(DataStore.DbConnection);
      bool ok = da.DeleteById(item.Id);
      if (ok) AddChangeLog(da.TableName, item.Id, item.Timestamp, revisionInfo); //delete
	  return ok;
    }
 static public DdRequestItemExt GetRequestItemInfo(int requestItemREF)
 {
   DaRequestItem da = new DaRequestItem(DataStore.DbConnection);
   if (da.GetById(requestItemREF))
     return new DdRequestItemExt(da.GetBuffer());
   else
     return null;
 }
 static public BindingList<DdRequestItemExt> GetRequestItems()
 {
   BindingList<DdRequestItemExt> list = new BindingList<DdRequestItemExt>();
   DaRequestItem da = new DaRequestItem(DataStore.DbConnection);
   DnRequestItem dn = da.Fill();
   foreach (DdRequestItem dd in dn) list.Add(new DdRequestItemExt(dd));
   return list;
 }
 static public BindingList<DdRequestItemExt> GetRequestItemList(int changeRequestREF)
 {
   DaRequestItem daRequestItem = new DaRequestItem(DataStore.DbConnection);
   DnRequestItem dn = daRequestItem.FillByChangeRequest(changeRequestREF);
   BindingList<DdRequestItemExt> list = new BindingList<DdRequestItemExt>();
   foreach (DdRequestItem dd in dn)
     list.Add(new DdRequestItemExt(dd));
   return list;
 }
 static public bool AddRequestItem(ref DdRequestItemExt item, RevisionInfo revisionInfo)
 {
   DaRequestItem da = new DaRequestItem(DataStore.DbConnection);
   da.Clear();
   da.ChangeRequestREF = item.ChangeRequestREF;
   da.Comment = item.Comment;
   da.Description = item.Description;
   da.EffectiveDate = item.EffectiveDate;
   da.ItemID = item.ItemID;
   da.Modified = item.Modified;
   da.ModifiedBy = item.ModifiedBy;
   bool ok = da.Insert();
   if (ok) AddChangeLog(da.TableName, da.Id, da.Timestamp, revisionInfo); //add
   if (ok) item = new DdRequestItemExt(da.GetBuffer());
   return ok;
 }
 static public bool SaveRequestItem(ref DdRequestItemExt item, RevisionInfo revisionInfo)
 {
   DaRequestItem da = new DaRequestItem(DataStore.DbConnection);
   if (!da.GetById(item.Id)) return false;
   da.ChangeRequestREF = item.ChangeRequestREF;
   da.Comment = item.Comment;
   da.Description = item.Description;
   da.EffectiveDate = item.EffectiveDate;
   da.ItemID = item.ItemID;
   bool ok = true;
   if (da._IsModified)
   {
     da.Modified = DateTime.Now;
     da.ModifiedBy = Environment.UserName;
     ok = da.Save();
     if (ok) AddChangeLog(da.TableName, da.Id, da.Timestamp, revisionInfo);
     if (ok) item = new DdRequestItemExt(da.GetBuffer());
   }
   return ok;
 }
 static public void UpdateRequestItem(BindingSource binding, int changeRequestREF, RevisionInfo revInfo)
 {
   BindingList<DdRequestItemExt> list = (BindingList<DdRequestItemExt>)binding.DataSource;
   try
   {
     using (TransactionScope scope = new TransactionScope())
     {
     DaRequestItem da = new DaRequestItem(DataStore.CloneDbConnection());
     foreach (DdRequestItemExt 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 (DdRequestItemExt item in list)
     {
       if (item.DeleteFlag) continue; // already done above
       //if (item.RequestItemID == string.Empty) continue; // already done above
       bool existing = da.GetById(item.Id);
       if (!existing)
       {
         da.Clear();
       }
       da.ChangeRequestREF = item.ChangeRequestREF;
       da.Comment = item.Comment;
       da.Description = item.Description;
       da.EffectiveDate = item.EffectiveDate;
       da.ItemID = item.ItemID;
       if (!existing)
       {
         da.ChangeRequestREF = changeRequestREF;
         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 = GetRequestItemList(changeRequestREF);
   }
   catch (AppEx)
   {
     throw;
   }
   catch (Exception exc)
   {
     throw new AppEx(exc, "Error updating RequestItem");
   }
 }