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Write Line("Comms worker thread started.....") ' Set up delegate to allow asynchronous calls between threads.

"Invoke or Begin Invoke cannot be called on a control until the window handle has been created." But Form1. -------------------------------- Public Delegate Sub Async_Update_Progress_caller(By Val Value_for_progress_bar As Integer) Public Sub Do Remote Communications() Console.

You can raise events in your class and handle them in the form.

When they are raised, you can call reportprogress() on the background worker.

I am new to all this so I do not know how to call these things and be thread safe about it and as such I get an error [of course, which is why I am here asking :)] that says "cross-thread operation not valid control 'progressbar1' accessed from a thread other than which is it called" or something to that effect. Run Worker Async() End Sub Private Sub Background Worker1_Do Work(sender As Object, e As System. You need to delegate them first but for showing progress (progressbar, label, etc) Backgroundworker has it owns method (Progress Changed()) that let you use the UI in a safe mode.

To Long Time String Return 0 End Function Private Sub Background Worker1_Do Work(sender As Object, e As Do Work Event Args) Handles Background Worker1. Invoke(System Loads()) End Sub End Class The basic gist of what I am trying to do is just load a background worker that updates 3 things on the primary form a progressbar that shows current system load a text label that shows the load by percent and a clock I know I can do all this with a simple timer, but when I go to add my other timers it tends to make the form all kinds of sluggish so I wish to learn how to shoot most of these things I want to do into a background thread. Do Work 'simulate long running processes Update Status(0, "Loading") System. Here is my code Private Sub time EDIT: You can't use UI Controls directly on Do Work method.

During this upgrade process I am showing a form that has a continuous progressbar.

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Mattias -- Mattias Sjgren [C# MVP] mattias @ | reply only to the newsgroup. Dim caller As New Async_Update_Progress_caller(Address Of Form1. Begin Invoke(caller) Now Im getting the following run time error. -------------------------------------------------------------------------------------------------- Public Class worker_class ' Set up delegate for assync function call. Write Line("Comms worker thread Finished.") End Sub End Class ---------------------------------------------------------------------------------------------------------- Thanks for your help Denis On Dec 4, pm, Mattias Sjgren I have the standardprogressbarandworkerthreadscenario with progressof theworkerthreadbeing fed back to the main UI and displayed on theprogressbar. I have the standard progress bar and worker thread scenario withprogress of the worker thread being fed back to the main UI anddisplayed on the progress bar. Begin Invoke(caller) Now Im getting the following run time error. -------------------------------------------------------------------------------------------------- Public Class worker_class ' Set up delegate for assync function call. Write Line("Comms worker thread Finished.") End Sub End Class ---------------------------------------------------------------------------------------------------------- Thanks for your help Denis On Dec 4, pm, Mattias Sjögren You should use Control.

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Mattias -- Mattias Sjögren [C# MVP] mattias @ mvps.org reply only to the newsgroup. Sleep(1000) Update Status(100, "Finished") End Sub 'all calls to update the progress bar and label go through here Private Sub Update Status(By Val progress As Integer, By Val status As String) Try If Me. Error) End Try End Sub Private Delegate Sub Update Status Callback(By Val progress As Integer, By Val status As String) 'This catually updates the control - modify the paramters and update to suit the control you are using Private Sub Update Status Delegate(By Val progress As Integer, By Val status As String) Progress Bar1. – user1567394 Aug 1 '12 at 1 Also does it NEED a workercompleted if it is always running as long as the form is loaded? Do Work Dim i as integer = 1 Do Until integer = 0 IF BW1.