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Here s the form method that you need. It simply calls the Worker.FindPrimes() method (synchronously), and then updates the user interface with the results. private void CallAsyncWorker(int from, int to) { // Start the search for primes and wait. DateTime startTime = DateTime.Now; int[] primes = Worker.FindPrimes(from, to); // (Update the user interface.) } Because you re calling the CallAsyncWorker() method asynchronously, you need to create a delegate for it that has the same signature: private delegate void CallAsyncWorkerDelegate(int from, int to); Now you can invoke the CallAsyncWorker() method on another thread when the user clicks the Find Primes button. Here s the code you need: private void cmdFind_Click(object sender, EventArgs e) { // Disable the button. cmdFind.Enabled = false; txtResults.Text = ""; lblTimeTaken.Text = ""; // Get the search range. int from, to; if (!Int32.TryParse(txtFrom.Text, out from)) { MessageBox.Show("Invalid From value."); return; } if (!Int32.TryParse(txtTo.Text, out to)) { MessageBox.Show("Invalid To value."); return; } // Start the search for primes on another thread. CallAsyncWorkerDelegate doWork = new CallAsyncWorkerDelegate(CallAsyncWorker); doWork.BeginInvoke(from, to, null, null); } Notice that this example disables the button so that only one asynchronous operation can be performed at a time. The button will be re-enabled when the asynchronous task is completed. asp.net mvc qr code Dynamically generate and display QR code Image in ASP . Net 5 Nov 2014 ... Here Mudassar Ahmed Khan has explained how to dynamically generate and display QR Code image using ASP . Net in C# and VB. Net .For generating QR Codes I will make use of QRCoder which is an Open Source Library QR code generator .In this article I will explain how to dynamically ... asp.net qr code Easy QR Code Creation in ASP . NET MVC - MikeSmithDev 11 Oct 2014 ... Today I was rebuilding a URL shortener site I wrote in ASP . NET Web Forms 4years ago (as usual, I hated all of my old code ). One part of the ... This example leaves out one detail the code for updating the user interface The problem is that NET controls exhibit thread affinity, which means that their properties and methods can be called only by code running on the same thread that created the control As a result, you can t modify the lblTimeTaken or txtResults controls from the CallAsyncWorker() method A new debugging feature in NET 20 helps you spot threading errors By default, every Windows control included with NET throws an InvalidOperationException when it s accessed from the wrong thread (You can disable this behavior by setting the static ControlCheckForIllegalCrossThreadCalls to false) However, it s important to realize that this is a debugging convenience, and these checks aren t made in a release-mode build Furthermore, third-party controls are unlikely to provide the same nicety. java ean 13,winforms upc-a,.net upc-a reader,data matrix barcode reader c#,code 39 word download,java data matrix barcode generator asp.net vb qr code Free c# QR - Code generator - Stack Overflow Take a look QRCoder - pure C# open source QR code generator . 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As a result, you need to be conscious of when you cross a thread boundary If you do access a control from another thread, you will run into unpredictable errors that can crash your application or freeze your user interface Worst of all, these types of errors happen sporadically, which makes them very difficult to diagnose Fortunately, all NET controls provide two members that you can access from other threads These include: InvokeRequired This property returns true if the current code is running on a thread other than the one that created the control, in which case you can t directly manipulate the control Invoke() This method allows you to fire a method on the correct user interface thread, so you can manipulate the control without causing an error You can use the Invoke() method to solve the problem in the current example. asp.net generate qr code Generate QR Barcode in ASP . Net MVC | Trailmax Tech 14 Sep 2012 ... Net MVC system. 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Text <- Printfsprintf "%A" eaResult) You can be certain that the RunWorkerCompleted event runs on the GUI thread, so it is fine to interact with GUI objects You ve wired up the events, but you have a couple tasks remaining First, you need to start the background worker: // start the worker off backgroundRunWorkerAsync() Second, you need to add all this code to the button s Click event You ve wrapped the preceding code in a function called runWorker(), so it s a simple matter of calling this code in the event handler: // hook up creating and running the worker to the button buttonClickAdd(fun _ -> runWorker()) Notice how this means you create a new background worker each time the button is clicked This happens because a background worker cannot be reused once it s in use. You just need to break your code down so that the user interface update happens in a separate method Here s an UpdateForm() method you could use for updating the interface (with the corresponding delegate): private delegate void UpdateFormDelegate(TimeSpan timeTaken, string primeList); private void UpdateForm(TimeSpan timeTaken, string primeList) { lblTimeTakenText = timeTakenTotalSecondsToString(); txtResultsText = primeList; cmdFindEnabled = true; } Now you can call the UpdateForm() method from the CallAsyncWorker() method using ControlInvoke() Here s how you need to revise the code: private void CallAsyncWorker(int from, int to) { // Start the search for primes and wait DateTime startTime = DateTimeNow; int[] primes = WorkerFindPrimes(from, to);. asp.net vb qr code How To Generate QR Code Using ASP . NET - C# Corner 24 Nov 2018 ... How To Generate QR Code Using ASP . NET . Introduction. Create an empty web project in the Visual Studio version of your choice. 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