You can implement the partial DataContext.OnSubmitError method to process errors, occurring during execution of SubmitChanges method. This method is called not just for concurrency conflicts, it is called for all errors that can occur, such as key or not null violation, . You can get the object, which update operation encountered an error, and then specify the further action with ContinueAction property. See the description of this property for more information.
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2