>We take it one step further and sub-class the generated class. That way we can add additional functionality to a DataSet. For example, we have an additional method that we add to each dataset class, called FillWithXML() that easily allows us to fill the DataSet from an XML string instead of from the SQL Server backend (useful for cached files).

Interesting.
Where do you keep your cached files?
- Session / Application objects?
- Hashtables in class static members?
- other?

Regards,