This post was going to be a rant about how using the ObjectDataSource was impossible to handle exceptions thrown while retrieving or updating data. After some experiments and reading some misleading posts I saw only three possible ways: Use a generic error handler like the Page Error event or the Application Error event in global.asax. Implement handlers for the Updating, Selecting and Deleting events of the GridView bound to the datasource, set the event.Cancel to true and then manually call the...