Linq Context.Add Renamded To

A number of Linq to Sql tutorials online are based on intial "Orcas" (now 3.5) release of the .Net Framework. A number of namechanges were made and I picked one up whilst learning Linq. Here's the error I received:

'System.Data.Linq.Table<Namespace>' does not contain a definition for 'Add' and no extension method
'Add' accepting a first argument of type 'System.Data.Linq.Table<Namespace>' could be found
(are you missing a using directive or an assembly reference?)

The context.Add methods was changed to context.InsertOnUpdate.