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Old October 2nd, 2008, 12:01 PM
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Default Text File and Progress bar

Hi Guys,

I wrote an application in VB.NET 2003 to read a text file line by line and generate an XML file with some values from the text file. The text file is 1 MB and the XML file after creation can be 3.7MB.

While the application is running it looks like is frozen, so i added a progress bar but the progress bar don't show any progress only after is done.

How can I refresh the progress bar to show the user that the program is doing something?

Strange and crazy, but everything is possible
Strange and crazy, but everything is possible
Old October 2nd, 2008, 09:03 PM
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The problem is likely that your process is busy doing the actual processing and no or few cycles are being dedicated to the UI. You need to create a new thread to handle the file I/O processing. .NET has a component called BackgroundWorker that you can put into the application. This component handles some of the details of dealing with progress updates from long running processes. You give the worker something to do and from that process you can call the "ReportProgress" method to report the progress of your process.

The reason that this is important is that you can't make UI update calls on a secondary thread. Only the thread that created the UI elements (forms, controls, etc) can make those calls. The background worker component handles the cross thread messaging for you which greatly simplifies simple background processing tasks.


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