Why am I getting this error:”Cross-thread operation not valid: Control lbFolders accessed from a thread other than the thread it was created on.”?

by

You can’t access GUI elements from a separate thread. Use a delegate to make the change.

eg.

lblStatus.Invoke((Action)(() => lblStatus.Text = counter.ToString()));

or older skool:

lblTest.Invoke((MethodInvoker)(delegate() 
{ 
  lblTest.Text = i.ToString(); 
}));

I’ve got a blog post on how to do this in all the .Net releases here.

More Related Contents:

  1. What’s wrong with using Thread.Abort()
  2. Run async method regularly with specified interval
  3. How can I set processor affinity to a thread or a Task in .NET?
  4. How to pass parameters to ThreadStart method in Thread?
  5. How to invoke a UI method from another thread
  6. The calling thread cannot access this object because a different thread owns it [duplicate]
  7. Updating an ObservableCollection in a separate thread
  8. Does a locked object stay locked if an exception occurs inside it?
  9. Code for a simple thread pool in C# [closed]
  10. Unable to use more than one processor group for my threads in a C# app
  11. Benefits of using async and await keywords
  12. Why does this simple .NET console app have so many threads?
  13. How to catch exceptions from a ThreadPool.QueueUserWorkItem?
  14. thread with multiple parameters
  15. Event handlers not thread safe? [duplicate]
  16. Difference between lock(locker) and lock(variable_which_I_am_using)
  17. Looking for an example of a custom SynchronizationContext (Required for unit testing)
  18. What is the difference between ManualResetEvent and AutoResetEvent in .NET?
  19. Lock (Monitor) internal implementation in .NET
  20. .NET 4.0 and the dreaded OnUserPreferenceChanged Hang
  21. Advantage of using Thread.Start vs QueueUserWorkItem
  22. Reading an int that’s updated by Interlocked on other threads
  23. How to get awaitable Thread.Sleep?
  24. Thread parameters being changed
  25. Queue of async tasks with throttling which supports muti-threading
  26. Parallel doesnt work with Entity Framework
  27. ThreadStaticAttribute in ASP.NET
  28. Handling events from out-of-proc COM server in managed STA application
  29. ReaderWriterLock vs lock{}
  30. When exactly does .NET Monitor go to kernel-mode?

Leave a Comment