NullReferenceException

[Frank Schürer]

Hi,

i have a problem concerning a standard radtextbox (Q2 2010 => 2010.2.10.914).
Sometimes, but not everytime, when i start entering a value into one of my radtextboxes the following error will be thrown.
There are no events associated with these radtextboxes and i have absolutely no idea why this error appears.
Any help appreciated.

System.NullReferenceException was not handled

  Message="Object Reference not set to an instance of an object"

  Source="Telerik.WinControls"

  StackTrace:

       at Telerik.WinControls.Keyboard.ChordMessageFilter.FindChordPattern(IList`1 list)

       at Telerik.WinControls.Keyboard.ChordMessageFilter.FindChordPattern()

       at Telerik.WinControls.Keyboard.ChordMessageFilter.ProccessChord()

       at Telerik.WinControls.Keyboard.ChordMessageFilter.System.Windows.Forms.IMessageFilter.PreFilterMessage(Message& msg)

       at System.Windows.Forms.Application.ThreadContext.ProcessFilters(MSG& msg, Boolean& modified)

       at System.Windows.Forms.Application.ThreadContext.PreTranslateMessage(MSG& msg)

       at System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FPreTranslateMessage(MSG& msg)

       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)

       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)

       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)

       at System.Windows.Forms.Application.Run(ApplicationContext context)

       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()

       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()

       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)

       at MediaCenter.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:Zeile 81.

       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)

       at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)

       at System.Runtime.Hosting.ManifestRunner.Run(Boolean checkAptModel)

       at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()

       at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData)

       at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext)

       at System.Activator.CreateInstance(ActivationContext activationContext)

       at 

Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()

       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)

       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

       at System.Threading.ThreadHelper.ThreadStart()

  InnerException: 

[Richard Slade]

Hi, 

One line in here 
(at 

Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone)
makes me think that this is not a Telerik issue. 
Is this specifically in debug mode? 
Can you try disabling the hosting process as detailed in this link:

http://msdn.microsoft.com/en-us/library/ms185330.aspx

Let me know if that helps
Richard

[Richard Slade]

you may also want to try deleting everything from the Obj and Bin directories and re-building. 
Richard

[Jack]

Hi Frank,

Thank you for reporting this issue. We have not observed it before and I was not able to reproduce it locally. Please send me your application and describe how exactly to reproduce it. I am looking forward to your reply.

All the best, Jack
the Telerik team

[Peter Szintai]

Hi All,

I do not want to unnecessarily revive the thread, but today we faced with the same problem (plus: we got the exception in the case of radgrids).
Version: 2012.1.321.20

We tried the suggestions, without success.
Later we found the problem: on the form in the Load event we called a method async, in the Shown event we called the same method again.
So, in our case it was a simple threading issue, but the exception message is misleading.

Regards,
Peter

[George]

Hello Peter,

Thank you for contacting us.

We recently encountered the issue described in this thread and it was addressed. The fix will be available in our upcoming release. Here is a link to the item at hand: 

http://www.telerik.com/support/pits.aspx#/details/Issue=15611.

If you have any other queries, do not hesitate to ask.

Regards,
George
Telerik