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let iterations = 18 let isInMandelbrotSet c0 = let rec check n c = (n = iterations) || (cMin < c) && (c < cMax) && check (n + 1) ((c * c) + c0) check 0 c0 let scalingFactor = 1.0 / 200.0 let offset = -1.0 let mapPlane (x, y) = let fx = ((float x) * scalingFactor) + offset let fy = ((float y) * scalingFactor) + offset complex fx fy let form = let image = new Bitmap(400, 400) for x = 0 to image.Width - 1 do for y = 0 to image.Height - 1 do let isMember = isInMandelbrotSet ( mapPlane (x, y) ) if isMember then image.SetPixel(x,y, Color.Black) let temp = new Form() in temp.Paint.Add(fun e -> e.Graphics.DrawImage(image, 0, 0)) temp [<STAThread>] do Application.Run(form)

100 Mbps wired connection. One or more computers that are running a supported operating system, with either a wired or a wireless network connection. Broadband connection. An external Internet broadband router/firewall device with 100 Mbps wired Ethernet connection. Additionally, Windows Home Server assumes that your home computers get their IP address from the router/ firewall device on your home network.

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private void cmdCancel_Click(object sender, EventArgs e) { backgroundWorker.CancelAsync(); } Nothing happens automatically when you call CancelAsync(). Instead, the code that s performing the task needs to explicitly check for the cancel request, perform any required cleanup, and return. Here s how you can add this code to the FindPrimes() method so that it checks just before it reports progress: for (int i = 0; i < list.Length; i++) { ... if ((i % iteration) && (backgroundWorker != null)) { if (backgroundWorker.CancellationPending) { // Return without doing any more work. return; } if (backgroundWorker.WorkerReportsProgress) { backgroundWorker.ReportProgress(i / iteration); } } } The code in the DoWork event handler also needs to explicitly set the DoWorkEventArgs.Cancel property to true to complete the cancellation. You can then return from that method without attempting to build up the string of primes. private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e) { FindPrimesInput input = (FindPrimesInput)e.Argument; int[] primes = Worker.FindPrimes(input.From, input.To, backgroundWorker); if (backgroundWorker.CancellationPending) { e.Cancel = true; return; } // (Code for building the prime list.) }

Even when you cancel an operation, the RunWorkerCompleted event still fires. At this point, you can check if the task was canceled, and handle it accordingly. private void backgroundWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { primeList = ""; statusPanel.Text = ""; if (e.Cancelled) { MessageBox.Show("Search cancelled."); } else if (e.Error != null) { MessageBox.Show(e.Error.Message, "An Error Occurred"); } else { primeList = (string)e.Result; statusPanel.Text = "Double-click panel to see new prime list."; } cmdFind.Enabled = true; } Now the BackgroundWorker component allows you to start a search and end it prematurely.

SharpDevelop is an open-source IDE with F# bindings that can be used for .NET and Mono development. The F# bindings are packaged with SharpDevelop, so to use them all you need to do is ensure that F# is installed then install SharpDevelop. After that it s just a matter of creating a new F# project and off you go. The F# bindings for SharpDevelop do not offer as much functionality as Visual Studio does only syntax highlighting and F# interactive are available. However, the development environment is still very useable, and the bindings are open source. So if you wish to extend them, you can help out with the project. Figure 2-4 shows SharpDevelop with an F# project open.

At first, the BackgroundWorker component seems like the perfect solution to building multithreaded applications, and in many cases it is. The BackgroundWorker component makes particularly good sense when you have a single long-running task that executes in the background. But the BackgroundWorker doesn t provide some features, such as the following: The ability to manage multiple asynchronous tasks at once. For example, you can t run multiple prime-number queries at once (at least not without some ugly workarounds). The ability to communicate in ways other than sending a progress report or cancellation request. For example, you can t pause an in-progress task or supply new information. You re limited to the features baked into the BackgroundWorker. The ability to directly access and manipulate details about the background thread (such as its priority). If you re creating an application that needs these features, you need to step up to the System.Threading.Thread class. The Thread class represents a new thread of execution. To use the Thread class, you begin by creating a new Thread object, at which point you supply a delegate to the method you want to invoke asynchronously. As with the delegate examples and the

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