Adding new Item into SharePoint List – Avoid the memory leakage

Never use SPList.Items.Add because this approach gets all items in the list before adding a new SPListItem.  Use the following method instead, which does not preload the list items:

private SPListItem OptimizedAddItem(SPList list)
       {
           const string EmptyQuery = "0";
           SPQuery q = new SPQuery {Query = EmptyQuery};
           return list.GetItems(q).Add();
       }

 

Thanks ROB GARRETT for this trick

http://blog.robgarrett.com/2009/02/25/efficient-way-to-add-a-new-item-to-a-sharepoint-list/