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1. Your page runs for the first time. ASP.NET creates page and control objects, the initialization code executes, and then the page is rendered to HTML and returned to the client. The page objects are also released from server memory. 2. At some point, the user does something that triggers a postback, such as clicking a button. At this point, the page is submitted with all the form data by using ViewState information. 3. ASP.NET intercepts the returned page and re-creates the page objects, taking care to return them to the state they were in the last time the page was sent to the client. 4. Next ASP.NET checks what operation triggered the postback, and it raises the appropriate events (such as Button.Click), which your code can react to. Typically, at this point you ll perform some server-side operation (such as updating a database or reading data from a file) and then modify the control objects to display new information. 5. The modified page is rendered to HTML and returned to the client. The page objects are released from memory. If another postback occurs, ASP.NET repeats the process in steps 2 through 4. In other words, ASP.NET doesn t just use the form data to configure the control objects for your page. It also uses it to decide what events to fire. For example, if it notices the text in a text box has changed since the last postback, it raises an event to notify your page. It s up to you whether you want to respond to this event.

If you determine it may be beneficial to have the garbage collector check for unreachable objects, you could explicitly trigger a garbage collection, as follows: static void Main(string[] args) {

Keep in mind that since HTML is completely stateless, and all state made available by ASP.NET is reconstituted, the event-driven model is really an emulation. ASP.NET performs quite a few tasks in the background in order to support this model, as you ll see in the following sections. The beauty of this concept is that the beginner programmer doesn t need to be familiar with the underpinnings of the system to take advantage of server-side events.

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... // Force a garbage collection and wait for // each object to be finalized. GC.Collect(); GC.WaitForPendingFinalizers(); ... } When you manually force a garbage collection, you should always make a call to GC.WaitForPendingFinalizers(). With this approach, you can rest assured that all finalizable objects (described in the next section) have had a chance to perform any necessary cleanup before your program continues. Under the hood, GC.WaitForPendingFinalizers() will suspend the calling thread during the collection process. This is a good thing, as it ensures your code does not invoke methods on an object currently being destroyed! The GC.Collect() method can also be supplied a numerical value that identifies the oldest generation on which a garbage collection will be performed. For example, to instruct the CLR to investigate only generation 0 objects, you would write the following: static void Main(string[] args) { ... // Only investigate generation 0 objects. GC.Collect(0); GC.WaitForPendingFinalizers(); ... } As well, the Collect() method can also be passed in a value of the GCCollectionMode enumeration as a second parameter, to fine-tune exactly how the runtime should force the garbage collection. This enum defines the following values: public enum GCCollectionMode { Default, // Forced is the current default. Forced, // Tells the runtime to collect immediately! Optimized // Allows the runtime to determine // whether the current time is optimal to reclaim objects. } As with any garbage collection, calling GC.Collect()promotes surviving generations. To illustrate, assume that our Main() method has been updated as follows: static void Main(string[] args) { Console.WriteLine("***** Fun with System.GC *****"); // Print out estimated number of bytes on heap. Console.WriteLine("Estimated bytes on heap: {0}", GC.GetTotalMemory(false)); // MaxGeneration is zero based. Console.WriteLine("This OS has {0} object generations.\n", (GC.MaxGeneration + 1));

Of course, one gap exists in the event system described so far. Windows developers have long been accustomed to a rich event model that lets your code react to mouse movements, key presses, and the minutest control interactions. But in ASP .NET, client actions happen on the client side, and server processing takes place on the web server. This means a certain amount of overhead is always involved in responding to an event. For this reason, events that fire rapidly (such as a mouse move event) are completely impractical in the world of ASP.NET.

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