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I couldn't find anything wrong but still thought the problem must be mine, and that I might have caused the problem during one of my earlier debugging sessions I rebooted the device, set up the tests to run again, and walked out the door When I got to work the next morning, the first thing I noticed was that the application had crashed again in the same place By this time, I had access to the source code for the application, and after spending about an hour debugging the problem The problem turned out not to be in the connection code Every time one of the computer names was selected, the application initiated code that did custom drawing.

Both Silverlight and WPF provide implementations of this interface: Silverlight provides the PagedCollectionView class, and WPF provides the ListCollectionView class Collection view classes work by wrapping an underlying collection of items so that they can provide automatic selection tracking and sorting, filtering, and paging for them You can use the CollectionViewSource class to create an instance of these classes programmatically or declaratively in XAML Note: In WPF, a default collection view will actually be created automatically whenever a control is bound to a collection In Silverlight, a collection view will be created automatically only if the bound collection supports the ICollectionViewFactory interface Collection view classes can be used by the view model to keep track of important state information for the underlying collection, while maintaining a clean separation of concerns between the UI in the view and the underlying data in the model.

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Sample of C# Code using System; using System.Web; using System.Threading; public class AsynchImageHandler : IHttpAsyncHandler { public bool IsReusable { get { return false; } } public AsynchImageHandler() { } public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData) { context.Response.Write("<p>BeginProcessRequest starting ...</p>"); ImageAsynchOperation imageOperation = new ImageAsynchOperation(cb, context, extraData); imageOperation.StartAsync(); context.Response.Write("<p>BeginProcessRequest queued ...</p>"); return imageOperation; } public void EndProcessRequest(IAsyncResult result) { //process any cleanup code here } public void ProcessRequest(HttpContext context) { throw new InvalidOperationException(); } } class ImageAsynchOperation : IAsyncResult { private bool _completed; private object _state; private AsyncCallback _callback; private HttpContext _context; public ImageAsynchOperation(AsyncCallback callback, HttpContext context, object state) { _callback = callback; _context = context; _state = state; _completed = false; }

public bool IsCompleted { get { return _completed; } } public System.Threading.WaitHandle AsyncWaitHandle { get { return null; } } public object AsyncState { get { return _state; } } public bool CompletedSynchronously { get { return false; } } public void StartAsync() { ThreadPool.QueueUserWorkItem(new WaitCallback(StartAsyncOperation), null); } public void StartAsyncOperation(object workItemState) { HttpRequest Request = _context.Request; HttpResponse Response = _context.Response; if (Request.RawUrl.ToLower().Contains("jellyfish")) { Response.Write("<p>JellyFish</p>"); } else if (Request.RawUrl.ToLower().Contains("koala")) { Response.Write("<p>Koala</p>"); } else { Response.Write("<p>Not found.</p>"); } Response.Write("<p>Asynch operation completed.</p>"); _completed = true; _callback(this); } }

The final step is to register your HTTP handler in the Web.config file. This process is the same as discussed previously (in the Registering the Handler by Using Web.config section). In this example, the handler will respond to files with *.asynchJpg extensions. Figure 10-2 shows the code running in a browser. Notice the order in which the messages are written out to the browser. This illustrates the different threads and the callback.

You can follow the asynchronous HTTP handler model to create an asynchronous webpage. This is a webpage that works with the IHttpAsynchHandler interface (instead of a registered handler for a specified file extension). For example, assume you were writing the asynchronous HTTP handler in the previous example as a webpage. This webpage would still use the same ImageAsynchOperation class that implements IAsynchResult as defined above. However, it would use this class not in a handler, but on a webpage. The following steps walk you through the basic process of implementing this example inside a standard ASPX page.

It was just a small blue flash so that the user would know that the application had recognized the mouse click, much like the way that a button in a Windows-based application appears to sink when pressed The problem in this application was that every time the test and drawing code ran, there was a resource leak After a few hundred connections, the resource leak was big enough that the application would crash when the custom drawing code ran I don't think I ever would have found this bug if I had been writing UI automation that executed functionality without going through the UI directly.

Add the Async="true" attribute to the @ Page directive inside your markup. This indicates that the page implements the IHttpAsynchHandler interface. The following shows an example.

Inside your page s code-behind file, create methods that get called to start and end your asynchronous operation typically named BeginProcessRequest and EndProcessRequest. The following shows an example. Notice that you no longer need to get a context object; the webpage provides this.

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