Saving and Reading ink in a database is one a common tasks for TabletPC. Hello InkWorld is a complete sample that includes a Step-by-Step Tutorial on how to setup an Access Database, create a Form to capture Name, Age, and Signature and read and write text and ink to a database. The source code can easily be changed to support other databases, e.g. SQL Server and Oracle. You can download HelloInkWorld from the website in my sig, or it still may be in the software library here at TabletPCBuzz.
The databinding features of the Agilix Infinote controls also might meet your needs. It all depends on where you are in your project.
Hope this helps,