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The following code shows the same console application in Visual Basic code: Namespace HelloWorld Public Class TestClass Private Shared Sub Main(Ars() As String) ConsoleWriteLine("Hello World") End Sub End Class End Namespace If you compile this application and look at the IL code, you ll find that every line is identical to the IL code generated from the C# version Although different compilers can sometimes introduce their own optimizations, as a general rule of thumb no NET language outperforms any other NET language, because they all share the same common infrastructure This infrastructure is formalized in the CLS (Common Language Specification), which is described in the The Common Language Specification sidebar It s important to note that IL was recently adopted as an ANSI (American National Standards Institute) standard This adoption could quite possibly spur the adoption of other common language frameworks The Mono project at http://wwwgo-mono.

In addition to standard declarations and calls, Python provides options that allow you to invoke functions in interesting ways. Django uses these techniques to help with efficient code reuse. You can use these same techniques in your applications as well; they are standard parts of Python.

com is an example of one such project..

If you ve installed the ASP.NET Development Helper introduced in 2 (and available at http://www.nikhilk.net/ASPNETDevHelperTool.aspx), you have another option for looking at tracing information viewing it in a separate window. When the ASP .NET Developer Helper is running (both on the web server and web browser), it automatically removes trace information from the page. To access it, you can either uncheck the Hide Trace from Page check box (which shows it in the page) or click the Show Trace link. Figure 3-13 shows this handy feature at work.

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Over the past several sections, you ve seen how the Page class exposes a significant number of useful features that let you retrieve information about the current HTTP context. These details are available because they re provided as properties of the Page class. But what if you want to retrieve this information from inside another class, one that doesn t derive from Page Fortunately, another way exists to get access to all the HTTP context information. You can use the System.Web.HttpContext class. This class exposes a static property called Current, which returns an instance of the HttpContext class that represents all the information about the current request and response. It provides the same set of built-in ASP.NET objects as properties.

Figure 3-13. Managing trace information with the ASP .NET Development Helper For example, here s how you would write a trace message from another component that doesn t derive from Page but is being used by a web page as part of a web request: HttpContext.Current.Trace.Write("This message is from DB Component"); If you want to perform multiple operations, it may be slightly faster to retrieve a reference to the current context and then reuse it: HttpContext current = HttpContext.Current; current.Trace.Write("This is message 1"); current.Trace.Write("This is message 2");

It s not always possible to know what arguments will be provided to a function at runtime. This is often the case in Django, where class methods are defined in source even before a subclass itself is customized appropriately. Another common situation is a function that can act on any number of objects. In still other cases, the function call itself can be made into a sort of API for other applications to utilize. For these situations, Python provides two special ways to define function arguments, which allow the function to accept excess arguments not handled by the explicitly declared arguments. These extra arguments are explained next. Note that the names and are merely Python conventions. As with any function argument, you may name them whatever you like, but consistency with standard Python idioms makes your code more accessible to other programmers.

The previous tests can be combined in a single call to test with the -a (logical AND) and -o (logical OR) operators: test -f /path/to/file -a $test -eq 1 test -x bin/file -o $test -gt 1 test is usually used in combination with if or the conditional operators && and ||.

Summary

In this chapter you walked through a detailed examination of the ASP.NET page. You learned what it is and how it really works behind the scenes with postbacks and view state. You also learned the basics of the server control model, took a close look at the System.Web.UI.Page class, and learned how to use tracing. In the next chapter, you ll take a closer look at the web controls that ASP.NET gives you to build sophisticated pages.

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