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To make sure this system works, you must keep both the .aspx markup file (with the control tags) and the .vb file (with the source code) synchronized. If you edit control names in one piece using another tool (such as a text editor), you ll break the link, and your code won t compile. Incidentally, you ll notice that control variables are always declared with the protected accessibility keyword. That s because of the way ASP.NET uses inheritance in the web-page model. The following three layers are at work: First, the Page class from the .NET class library defines the basic functionality that allows a web page to host other controls, render itself to HTML, and provide access to the traditional ASP objects such as Request, Response, and Session. Second, your code-behind class (for example, TestFormCodeBehind) inherits from the Page class to acquire the basic set of ASP.NET web-page functionality. Finally, the .aspx page (for example, HelloWorldPage.aspx) uses the code from the custom page class you created. This allows it to combine the user interface with the code that supports it. Protected variables act like private variables with a key difference they are accessible to derived classes. In other words, using protected variables in your code-behind class ensures that the variables are accessible in the derived page class. This allows ASP .NET to connect your control variables to your control tags at runtime.

By default the maximum size of the uploaded file is 4 MB. If you try to upload a bigger file, you ll get a runtime error. To change this restriction, modify the maxRequestLength attribute of the <httpRuntime> setting in the application s web.config file. The size is specified in kilobytes, so <httpRuntime maxRequestLength="8192"/> sets the maximum file size to 8 MB.

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FindControl() method This has one additional wrinkle You can t create a user control object directly, like you can with an ordinary control That s because user controls aren t entirely based on code they also require the control tags that are defined in the ascx file To use a user control, ASPNET needs to process this file and initialize the corresponding child control objects To perform this step, you need to call the PageLoadControl() method When you call LoadControl(), you pass the filename of the ascx user control markup file LoadControl() returns a UserControl object, which you can then add to the page and cast to the specific class type to access control-specific functionality Here s an example that loads the TimeDisplay user control dynamically and adds it to the page using a PlaceHolder control: TimeDisplay ctrl = (TimeDisplay)PageLoadControl("TimeDisplayascx"); PlaceHolder1Controls.

The first step you can follow to integrate your website is to adopt a consistent visual style. In other words, standardize ruthlessly. If you want to tweak the font or border of a button, make sure you change it for every button you include. Being consistent isn t always easy. To help manage the details, you can use CSS or themes.

Although it s fairly easy to create a unique filename, what happens in the situation where you really do need to access the same file to serve multiple different requests Although this situation isn t ideal (and often indicates that a database-based solution would work better), you can use certain techniques to defend yourself. One approach is to open your files with sharing, which allows multiple processes to access the same file at the same time. To use this technique, you need to use the four-parameter FileStream constructor that allows you to select a FileMode. Here s an example: FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read); This statement allows multiple users to open the file for reading at the same time. However, no one will be able to update the file.

Add(ctrl); Despite this slightly awkward detail, dynamically loading is a powerful technique when used in conjunction with user controls It s commonly used to create highly configurable portal frameworks..

One of the most common ways to apply standardized formatting is to use CSS (Cascading Style Sheets). CSS provides a cross-platform solution for formatting web pages that works in conjunction with HTML 4 and is supported by virtually all modern browsers. In fact, early versions of Visual Studio automatically generated a Styles.vbs file for you to use in your website. (Later versions of Visual Studio abandoned this practice in favor of less clutter.)

Another technique that works well if multiple users need to access the same data, especially if this data is frequently used and not excessively large, is to load the data into the cache (as described in 11). That way, multiple users can simultaneously access the data without a hitch. If another process is responsible for creating or periodically updating the file, you can use a file dependency to invalidate your cached item when the file changes.

Although it takes a fair bit of boilerplate code to create a complete portal framework, you can see the most important principles with a simple example. Consider the page shown in Figure 14-6. It includes a panel that contains three controls a DropDownList, a Label, and a PlaceHolder control.

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