I was using the ObjectDataSource today to display and delete data using a GridView. When I tried to delete a record that was referenced in another table an exception was thrown due to referential integrity.
I found that in implementing the Deleted event of the ObjectDataSource, the ObjectDataSourceStatusEventArgs class had a boolean property called ExceptionHandled. Setting this to true stops the ObjectDataSource from re-throwing the exception, allowing you to handle it yourself. You can obtain the underlying exception using the Exception property.
protected void odsUser_Deleted(object sender, ObjectDataSourceStatusEventArgs e)
{
   if (e.Exception != null)
   {
       e.ExceptionHandled = true;
       //Perform own exception handling
       lblError.Text = e.Exception.Message;
   }
}
You could also use the same approach with the Updated event.
