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required assemblies. Using the @Import directive allows you to use shorter class names, but as long as the assembly that contains the class code is not properly referenced, the compiler will generate a type error. In this case, using the fully qualified class name is of no help because the compiler lacks the type definition. You might have noticed that, more often than not, assembly and namespace names coincide. The latest version of Visual Studio (as well as some commercial products such as JetBrains ReSharper) is able to detect when you lack a reference and offers to import the namespace and reference the assembly with a single click. This is pure tooling activity namespaces and assemblies are totally different beasts.

The directive indicates that the current page implements the specified .NET Framework interface. An interface is a set of signatures for a logically related group of functions. An interface is a sort of contract that shows the component s commitment to expose that group of functions. Unlike abstract classes, an interface doesn t provide code or executable functionality. When you implement an interface in an ASP.NET page, you declare any required methods and properties within the <script> section. The syntax of the @Implements directive is as follows:

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You can learn more details about the events that you can record in the SQL Server Books Online article Analysis Services Event Classes When you use SQL Server Profiler, you should only monitor those events that you are most interested in Monitoring too many events makes it hard to interpret the results, impacts performance, and causes the trace to become very large You can also filter events so that you only record events generated by a particular user, client application, or Analysis Services database After you have created a trace, you can save it as a template so that you can easily execute a trace with the same settings at a later date or on a different server In this section, you will create a SQL Server Profiler trace and monitor Analysis Services while you execute a series of MDX queries .

Click the Layout tab, click the table to display handles, and then click the detail row row handle to select the entire row. In the Properties window, expand the Visibility category, and then click True in the Hidden property list box. The Hidden property, when set to True, prevents a report item from appearing in a report. However, the value can still be referenced by an expression associated with another report item. Click the table1_Order footer row handle. In the Properties window, expand the Visibility category, and then click True in the Hidden property list box. Save, and then preview the report. The report should look like this:

The @Implements directive can appear multiple times in the page if the page has to implement multiple interfaces. Note that if you decide to put all the page logic in a separate class file, you can t use the directive to implement interfaces. Instead, you implement the interface in the code-behind class.

The @Reference directive is used to establish a dynamic link between the current page and the specified page or user control. This feature has significant implications for the way you set up cross-page communication. It also lets you create strongly typed instances of user controls. Let s review the syntax. The directive can appear multiple times in the page. The directive features two mutually exclusive attributes: Page and Control. Both attributes are expected to contain a path to a source file:

The Page attribute points to an .aspx source file, whereas the Control attribute contains the path of an .ascx user control. In both cases, the referenced source file will be dynamically compiled into an assembly, thus making the classes defined in the source programmatically available to the referencing page. When running, an ASP.NET page is an instance of a .NET Framework class with a specific interface made of methods and properties. When the referencing page executes, a referenced page becomes a class that represents the .aspx source file and can be instantiated and programmed at will. For the directive to work, the referenced page must belong to the same domain as the calling page. Cross-site calls are not allowed, and both the Page and Control attributes expect to receive a relative virtual path.

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