Annotations on a document could potentially be modified and sent to the server by multiple users at any given time. When saving annotations, ImageGear will first call the provider to read the current annotations, merge in the changes, and then call the provider to save the annotations. To protect the integrity of annotation data during this operation, ImageGear uses a .NET framework object, System.Transactions.TransactionScope.

This section provides information about the following:

• Annotation Using Built-In Providers
• Enabling Annotation within a Custom Image Data Provider
• Background Information on Transactions
• Using a Transactional Resource
• Using a Non-Transactional Resource
• Helper Abstract Classes in ImageGear.Web.Services Assembly