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your data from a dynamic data source only on the first page load. On a postback, you can simply sit back, relax, and let ASP.NET restore the control properties for you from the view state. This can provide a dramatic performance boost if the information is expensive to re-create (for example, if you need to query it from a database). Second, there are also other scenarios, such as edit forms and drill-down pages, in which you need the ability to display one interface on a page s first use and a different interface on subsequent loads. To determine the current state of the page, you can check the static Page.IsPostBack property, which will be false the first time the page is requested. Here s an example: if (!Page.IsPostBack) { // It's safe to initialize the controls for the first time. FirstName.Text = "Enter your name here"; }

This object, typically an instance of a class specified as , contains attributes to indicate whether the backend supports each of a variety of database-related

IsPostBack is a static property of the Page class. It always returns the information based on the current page. You can also use the instance property IsPostBack (as in this.IsPostBack), which returns the same value. Which approach you use is simply a matter of preference.

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Remember, view state stores every changed property. Initializing the control in the Page.Load event counts as a change, so any control value you touch will be persisted in view state, needlessly enlarging the size of your page and slowing transmission times. To streamline your view state and keep page sizes small, avoid initializing controls in code. Instead, set the properties in the control tag (either by editing the tag by hand in source view or by using the Properties window). That way, these details won t be persisted in view state. In cases where it really is easier to initialize the control in code, consider disabling view state for the control by setting EnableViewState to false and initializing the control every time the Page.Load event fires, regardless of whether the current request is a postback.

ASP .NET introduces new validation controls that can automatically validate other user input controls and display error messages. These controls fire after the page is loaded but before any other events take place. However, the validation controls are for the most part self-sufficient, which means you don t need to respond to the validation events. Instead, you can just examine whether the page is valid (using the Page.IsValid property) in another event handler. 4 discusses the validator controls in more detail.

At this point, the page is fully loaded and validated. ASP .NET will now fire all the events that have taken place since the last postback. For the most part, ASP .NET events are of two types: Immediate response events: These include clicking a submit button or clicking some other button, image region, or link in a rich web control that triggers a postback by calling the __doPostBack() JavaScript function. Change events: These include changing the selection in a control or the text in a text box. These events fire immediately for web controls if AutoPostBack is set to true. Otherwise, they fire the next time the page is posted back.

1. 2.

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As you can see, ASP.NET s event model is still quite different from a traditional Windows environment. In a Windows application, the form state is resident in memory, and the application runs continuously. That means you can respond to an event immediately. In ASP .NET, everything occurs in stages, and as a result events are sometimes batched together. For example, imagine you have a page with a submit button and a text box that doesn t post back automatically. You change the text in the text box and then click the submit button. At this point, ASP.NET raises all of the following events (in this order): Page.Init Page.Load TextBox.TextChanged Button.Click Page.PreRender Page.Unload Remembering this bit of information can be essential in making your life as an ASP.NET programmer easier. There is an upside and a downside to the event-driven model. The upside is that the event model provides a higher level of abstraction, which keeps your code clear of boilerplate code for maintaining state. The downside is that it s easy to forget that the event model is really just an emulation. This can lead you to make an assumption that doesn t hold true (such as expecting information to remain in member variables) or a design decision that won t perform well (such as storing vast amounts of information in view state).

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