Vb Net Update Progress Bar Backgroundworker Threadless

You are putting the bulk of the working code outside of the thread, which is defeating the purpose of running a separate thread at all. The reason that the progress bar takes so long to appear then disappears almost immediately is because your code is running on the same thread as the interface, so it isn't letting the progress bar appear until it is already redundant.

SQL queries return sets. You issue the query then wait for the response. There is no loop into which you can embed a progress bar update. Doing a SELECT COUNT to get the actual number of rows, then executing the query to get the data is a bad idea. [Archive] VB.Net - How to update a UI ProgressBar from a worker thread? Programmers Discussion Forum Rage3D. To make it actually useful you can easily extend the code to allow the worker thread to set the maximum of the progress bar, as hard coding it is a bit daft. If anyone has a more elegant vb.net solution, shout up.:D.

The for loop inside the ThreadStart is a placeholder intended to simulate the load of an actual process that might be running during the time a progress bar is displayed. Remove that for loop from the thread and replace it with your code. Thanks for the feedback, and a Cancel button is actually a good idea. There's several ways to do this, and the different methods follow different schools of thought. Personally, this is how I would go about it: 1) The idea of cancelling implies that cancelling would mean that the process would be negated, and the end result would be as if the process had never begun in the first place.

To that end, altar the code above so that every bit of data it is altering is instead done to a dummy variable for as long as possible, with those changes being moved to the actual data only at the very end. In this case, when the process is cancelled, chances are that the only thing it would have to do is to dump the dummy variable, and nothing more permanent would be changed.

2) Interrupting a process in mid run is a bit of a challenge to do smoothly. The first approach would be to have a common boolean variable cancelFlag that the process periodically checks, and runs clean-up code if the variable is true. I'm sure there is a more fluid way of doing this, though, as this approach would not translate well to a large-scale process. (My gut is telling me that it would possibly involve parallel sentry threads or a series of locks, but I'm not sure enough to give a concrete explanation.) Ultimately, the approach that would work best would depend on the nature of the process being cancelled.

Hope I gave you enough of a hint.

I am stuck with BackGroundWorker. I learn Three basic steps to do work with Background worker. Step 1:- DoWork Event -- In this we do our work. Call Methods, Function, execute Querys' etc. Sito dove trovare keygen. And also enables background Properties like WorkerReportsProgress, WorkerSupportsCancellation etc.

Step 2: ProgressChanged event: This is used to increment Progressbar value,and enable's access forms controls. Step 3: RunWorkerCompleted Event: It tells Work is completed or not. But my problem is how to calculate max value for Progress Bar, how to increment Progress bar, because i have to call different methods some will retrieve values from Database, some will do work within the application.

I changed style to Marque and set MarqueeAnimationSpeed but due to lot of Processing it hides the Progressbar. If i put all methods in one Method then call that method in DoWork Event then it hides Progressbar. And shows it after doing all work. If I call the part which take lot of time in DoWork event. By Calling method BackgrounfWorker.RunWorkerAsync() on btn_Click event then before going to DoWork Event it is executting lines bellow this method after executting all these then it is executting RunWorkAsync() method. Please help me how to solve this Problem. What do you mean with 'it hides the ProgressBar'?

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You may take a look at. I think someone took that example at the link, dumbed it down a bit to make less code, and put it into the MSDN Library under VS2010.

It contains examples in 3 languages. VS2008 (original posts and complaints) VS2010 (notice date of feedback comment at bottom) I had complained that the Fibonacci example is way too complex if you do not understand the math. So, they added a second, simpler example to the VS2010 library. The first example is nearly identical to my sample. VS2010 (notice date of ChangeHistory at bottom) It even uses the label to display percentage! Rudy =8^D Mark the best replies as answers. 'Fooling computers since 1971.'