ASPNET Page Processing Basics in Visual Studio .NET

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ASPNET Web form processing is based on a postback model When a page first gets visited by a user (either by directly addressing it in the browser address bar or by following a link on another page or a favorite), the page is rendered by ASPNET This involves creating an instance of the page class, firing some events that are part of the page processing, and having each of the controls on the page render themselves into the response stream in the form of HTML that a browser can then render on the user's desktop If a page is designed to be interactive (rather than just a plain rendering of content), then the ASPNET processing model is designed to have a page postback This means that the user takes some action in the page, such as clicking a button or selecting a control, and this results in a new request being sent from the browser to the ASPNET Web application for the same page The new request is an HTTP POST request for the same page, and it may carry along any number of parameters from the embedded controls on the page The page processing code and the controls themselves may then choose to render the page content differently based on the posted back parameters Typically, ASPNET pages built with Visual Studio are constructed of a combination of the page itself, which is an ASPX file containing the markup describing the page and its contents, and a code-behind class that gets defined in a separate source file and compiled at design time to an assembly that is loaded by ASPNET at runtime The markup code in the ASPX file gets compiled into a class along with the code from the codebehind class, which will either be a partial class definition that gets blended with the ASPX file definition (the default model in ASPNET 20), or the page class can derive from the code-behind class, which itself derives from the ASPNET Page base class (the ASPNET 11 model) The code that handles postback processing and event handling typically resides in the code-behind class, although ASPNET also supports putting all supporting code for the page in script blocks in the ASPX file itself The ASPX markup file can also contain embedded script blocks of various types for inline computation of content that will be emitted as HTML
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Data Binding in ASPNET 1X
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Data binding in ASPNET 1X involved a combination of data-bound controls, data-binding expressions in the page markup, data sources, and data-binding event processing that was part of the page-rendering lifecycle The mechanisms for data binding in NET 1X still work in NET 20 for backward-compatibility reasons, and you will still use many of the same constructs However, the approach has changed quite a bit, and there are a number of new controls that support the new process that are discussed in the rest of this appendix Additionally, there have been some significant changes in the Visual Studio experience when developing ASPNET Web applications in Visual Studio 2005 compared to Visual Studio NET 2003 You no longer use projects to manage Web applications; you just work on individual files and artifacts that are part of a Web folder There are also new features, like dynamic code compilation for support code and script callbacks that let server controls refresh their contents in the browser without performing a full postback of the entire page However, it is worthwhile to review how data binding worked in ASPNET 1X to understand the differences between the Web data-binding model and that of Windows Forms, in case you get exposed to any existing ASPNET applications that were built before NET 20 came out You can still use the ASPNET 1X controls in ASPNET 20 applications, but it is recommended that you adopt the new approach to data binding to reduce the amount of code you need to write and maintain ASPNET 1X data-bound controls follow a similar data-binding process to their Windows Forms counterparts For example, the ASPNET DataGrid control is a complex tabular control that lets you show tables of data, select rows, edit them, sort columns, and page through the data The DataGrid has a DataSource property that you set to a collection of data and a DataMember property that you can use to refine what collection of data within that collection you want to use for complex containers of data like a data set The DataGrid default behavior involves iterating over the table specified by its DataSource and DataMember properties and will render each row in the collection as an HTML table on the page There is a great deal of flexibility in formatting the output HTML, both from a look-and-feel perspective and in terms of which columns of data get included To handle things like sorting, selecting, and editing requires handling events fired by the control on postback The DataGrid control, like many ASPNET server controls, are template driven, allowing you to customize exactly what gets rendered for each cell of the resulting table, although the code to do so can become somewhat arcane and isn't intended for beginners
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