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{ get {return (string)ViewState["ImageUrl"];} set {ViewState["ImageUrl"] = value;} } The only customization you need to do is add a few additional attributes to render. These include the unique control name, the image URL, and the onClick attribute that wires the image up to the __doPostBack() function, as follows: protected override void AddAttributesToRender(HtmlTextWriter output) { output.AddAttribute("name", UniqueID); output.AddAttribute("src", ImageUrl); output.AddAttribute("onClick", Page.ClientScript.GetPostBackEventReference(this, String.Empty)); } This is enough to trigger the postback, but you need to take additional steps to participate in the postback and raise an event. This time, you need to implement the IPostBackEventHandler interface. This interface defines a single method named RaisePostBackEvent(): public class CustomImageButton : WebControl, IPostBackEventHandler { ... } When the page is posted back, ASP.NET determines which control triggered the postback (by looking at each control s UniqueID property), and, if that control implements IPostBackEventHandler, ASP.NET then calls the RaisePostBackEvent() method with the event data. At this point, all the controls on the page have been initialized, and it s safe to fire an event, as shown here: public event EventHandler ImageClicked; public void RaisePostBackEvent(string eventArgument) { OnImageClicked(new EventArgs()); } protected virtual void OnImageClicked(EventArgs e) { // Check for at least one listener, and then raise the event. if (ImageClicked != null) ImageClicked(this, e); } Figure 27-8 shows a sample page that tests the CustomImageButton control and responds to its event.

This method starts out by checking whether the user is authenticated or not. Remember, uses to support anonymous users, so this step is necessary to make that distinction. By also checking to see if the request even has a attribute at all, this handles cases where the default is disabled or is placed after in the setting. Continuing on, is curried into a new function, with the current user preloaded as its first argument. The resulting function is now configured for use as a signal handler. This signal will be registered for every incoming request, since the only way to know the current user is to get it when the request comes in. It must be removed when the request is finished; otherwise, multiple signal handlers would be competing to update the same fields. Since is curried, there won t be a reference for it once finishes executing. In order to keep it from being destroyed before it can be useful, it gets registered with . Since the middleware doesn t get to keep a reference to the curried function, the argument provides an alternative reference for the handler. There will only be one signal handler for each incoming request, so the request object is a suitable unique identifier. Once the curried is then registered on the signal, Django continues on with other middleware and executes the view. Any models updated during that time will be checked by and updated as necessary. Once the view finishes, Django enters the response phase of middleware processing, where needs to remove the listener, using the request to identify it.

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This control doesn t offer any functionality you can t already get with existing ASP.NET web controls, such as the ImageButton. However, it s a great starting point for building something that s much more useful. In 29, you ll see how to extend this control with JavaScript code to create a rollover button something with no equivalent in the .NET class library.

Follow stateless design practices: Accept all the information needed for a method in its parameters, and return all the retrieved data through the return value If you create a class that maintains state, it cannot be easily implemented as a web service or used in a load-balancing scenario Also, if the database component is hosted out of the process, each method call has a measurable overhead, and using multiple calls to set properties will take much longer than invoking a single method with all the information as parameters Don t let the client specify connection string information: This poses security risks, raises the possibility that an out-of-date client will fail, and compromises the ability of connection pooling, which requires matching connection strings Don t connect with the client s user ID: Introducing any variability into the connection string will thwart connection pooling, as you learned in the previous chapter.

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