We are required to restore the sorting order that was entered by the user. To accomplish this, we are currently saving the sortdescriptors of the grid to a database and loading them when the page is opened. This persistence works fine, but when attempting to restore the sortdescriptors on the grid at runtime, we receive the following error:
System.CrossAppDomainMarshaledException was unhandled
Message: System.NullReferenceException: Object reference not set to an instance of an object.
at FleetFence2.App.Application_UnhandledException(Object sender, ApplicationUnhandledExceptionEventArgs e)
at MS.Internal.Error.CallApplicationUEHandler(Exception e)
at MS.Internal.Error.CallAUEHandler(UInt32 hr, UInt32& bIsHandled)
This error is thrown asynchronously (so not while on a certain line), but only occurs when the descriptors have been changed by the following piece of code:
This piece of code is executed for each column that was marked to be sorted. The data that is used to instantiate the SortDescriptor is correct: the fields exists and the sortorder is valid.
Have you got any idea what can cause this error? The grid itself is bound to the Data property of a DomainDataSource control, using WCF Ria Services and LINQ To SQL.
Hoping you can help,