ASP.NET 4 Unleashed

Concurrency and the ObjectDataSource Control

Imagine that two users open the same page for editing the records in the movies database table at the same time. By default, if the first user submits changes before the second user, the first user’s changes are overwritten. In other words, the last user to submit changes wins.

This default behavior of the ObjectDataSource control can be problematic in an environment in which a lot of users work with the same set of data. You can modify this default behavior by modifying the ObjectDataSource control’s ConflictDetection property. This property accepts the following two values:

• CompareAllValues— Causes the ObjectDataSource control to track both the original and new values of its parameters.

• OverwriteChanges ...