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namespace that uses the name of their company and software product. The fully qualified name of a class will then almost certainly be unique. Namespaces don t take an accessibility keyword and can be nested as many layers deep as you need. Nesting is purely cosmetic for instance, in the previous example, no special relationship exists between the MyCompany namespace and the MyApp namespace. In fact, you could create the namespace MyCompany.MyApp using this syntax without using nesting: Namespace MyCompany.MyApp Public Class Product ' Code goes here. End Class End Namespace You can declare the same namespace in various code files. In fact, more than one project can even use the same namespace. Namespaces are really nothing more than convenient, logical containers that help you organize your classes.

NET adds a special JavaScript function that detects when the focus changes The actual implementation of this JavaScript code is somewhat complicated, but ASPNET handles all the details for you automatically As a result, if you try to click the OK button with an invalid value in txtValidated, your actions will be ignored, and the page won t be posted back Not all browsers will support client-side validation To see what will happen on a down-level browser, set the RangeValidatorEnableClientScript property to false, and rerun the page Now error messages won t appear dynamically as you change focus However, when you click the OK button, the page will be returned from the server with the appropriate error message displayed next to the invalid control The potential problem in this scenario is that the click event handling code will still execute, even though the page is invalid.

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Having to type long, fully qualified names is certain to tire your fingers and create overly verbose code. To simplify matters, it s standard practice to import the namespaces you want to use. When you import a namespace, you don t need to type the fully qualified type names. Instead, you can use the types in that namespace as though they were defined locally. To import a namespace, you use the Imports statement. These statements must appear as the first lines in your code file, outside of any namespaces or classes (and after any Option statements, such as Option Strict): Imports MyCompany.MyApp Consider the situation without importing a namespace: Dim salesProduct As New MyCompany.MyApp.Product() It s much more manageable when you import the MyCompany.MyApp namespace. Once you do, you can use this shortened syntax instead: Dim salesProduct As New Product() Importing namespaces is really just a convenience. It has no effect on the performance of your application. In fact, whether you use namespace imports, the compiled IL code will look the same. That s because the language compiler will translate your relative class references into fully qualified class names when it generates an EXE or a DLL file.

Listing 9-15 shows an example of a clean-failure load attempt using both spl_autoload_ call() and class_exists() in non-autoloading mode. Listing 9-15. Clean Loading //Try to load className.php if(spl_autoload_call('className') && class_exists('className',false) ) { echo 'className was loaded';

To correct this problem and ensure that your page behaves the same on modern and older browsers, you must specifically abort the event code if validation hasn t been performed successfully..

' Indicate that this string should be used to vary caching Return BrowserName Else ' For any other type of caching, use the default logic Return MyBaseGetVaryByCustomString(context, arg) End If End Function The GetVaryByCustomString() function passes a string with a value of VaryByCustom in the arg parameter This allows you to create an application that implements several types of custom caching in the same function Each type would use a different VaryByCustom name (such as Browser, BrowserVersion, or DayOfWeek) Your GetVaryByCustomString() function would see the value VaryByCustom in the arg parameter and then return the appropriate caching string If the caching strings for different requests match, ASPNET will reuse the cached copy of the page Or to look at it another way, ASPNET will create and store a separate cached version of the page for each caching string it encounters.

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