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Another very important member of HttpRequest is the IsPostBack property. Recall that postback refers to a web page posting back to the same URL at the Web server. Given this definition, understand that the IsPostBack property will return true if the current HTTP request has been sent by a user currently in session, and false if this is the user s first interaction with the page. Typically, the need to determine whether the current HTTP request is indeed a postback is most helpful when you wish to execute a block of code only the first time the user accesses a given page. For example, you may wish to populate an ADO.NET DataSet when the user first accesses an *.aspx file and cache the object for later use. When the caller returns to the page, you can avoid the need to hit the database unnecessarily (of course, some pages may require that the DataSet always be updated upon each request, but that is another issue). Assuming your *.aspx file has handled the page s Load event (described in detail later in this chapter), you could programmatically test for postback conditions as follows: protected void Page_Load(object sender, System.EventArgs e) { // Fill DataSet only the very first time // the user comes to this page. if (!IsPostBack) { // Populate DataSet and cache it! } // Use cached DataSet. }

Summary

Now that you have a better understanding of how the Page type allows you to interact with the incoming HTTP request, the next step is to see how to interact with the outgoing HTTP response. In ASP.NET, the Response property of the Page class provides access to an instance of the HttpResponse type. This type defines a number of properties that allow you to format the HTTP response sent back to the client browser. Table 32-6 lists some core properties. Table 32-6. Properties of the HttpResponse Type

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In this chapter, you learned how to create basic database components and took an in-depth look at the DataSet and DataView. In the next chapter, you ll continue working with the same database component and the DataSet albeit through a new layer. You ll learn how the data source controls wrap the ADO.NET world with a higher-level abstraction and let you build rich data-bound pages with minimal code. If you do want to learn about all the features of the DataSet, including those that are tailored to distributed and rich client applications, you may want to consult Programming Microsoft ADO.NET 2.0: Core Reference (Microsoft Press, 2005) or Pro ADO.NET 2.0 (Apress, 2005).

Cache ContentEncoding ContentType Cookies Output OutputStream StatusCode StatusDescription SuppressContent

Returns the caching semantics of the web page (see 34) Gets or sets the HTTP character set of the output stream Gets or sets the HTTP MIME type of the output stream Gets the HttpCookie collection that will be returned to the browser Enables text output to the outgoing HTTP content body Enables binary output to the outgoing HTTP content body Gets or sets the HTTP status code of output returned to the client Gets or sets the HTTP status string of output returned to the client Gets or sets a value indicating that HTTP content will not be sent to the client

lmost every web application has to deal with data, whether it s stored in a database, an XML file, a structured file, or something else. Retrieving this data is only part of the challenge a modern application also needs a convenient, flexible, and attractive way to display the data in a web page. Fortunately, ASP.NET includes a rich and full-featured model for data binding. Data binding allows you to bind the data objects you ve retrieved to one or more web controls, which will then show the data automatically. That means you don t need to write time-consuming logic to loop through rows, read multiple fields, and manipulate individual controls. ASP .NET 2.0 goes one step further with a new set of data source controls. A data source control allows you to define a declarative link in your ASPX markup between the page and a data source (such as a database or a custom data access component). Data source controls are notable for the way they plug into the data binding infrastructure. Once you ve configured a data source control, you can hook it up to your web controls at design time, and ASP .NET will take care of all the data binding details. In fact, by using a data source control, you can create a sophisticated page that allows you to query and update a database all without writing a single line of code.

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