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From this point on, your page code takes over, until it encounters an unhandled error (UnhandledException) or finally ends (Exit). These events Startup, UnhandledException, and Exit are the core events that the Application class provides. Along with these standards, the Application class includes two events InstallStateChanged and CheckAndDownloadUpdateCompleted that are designed for use with the out-of-browser applications you ll explore later in this chapter. If you look at the contents of the App.xaml.cs file, you ll see that in Visual Studio, the application constructor contains some pregenerated code. This code attaches an event handler to the three application events: public App() { this.Startup += this.Application_Startup; this.Exit += this.Application_Exit; this.UnhandledException += this.Application_UnhandledException; InitializeComponent(); } As with the page and element events you ve considered in earlier chapters, there are two ways to attach application event handlers. Instead of using code, you can add event attributes to the XAML markup, as shown here: <Application ... x:Class="SilverlightApplication1.App" Startup="Application_Startup" > There s no reason to prefer one approach to the other. By default, Visual Studio uses the code approach shown first. In the following sections, you ll see how you can write code that plugs into the application events.

Just because a table is small today, doesn t mean it will be small three, six, or 12 months from now Make sure the index strategy that you deploy considers those facts Determining the speed of the writes on a table is essential prior to index creation In SQL Server 2008, there are several methods for capturing this information Those who control data access via stored procedures have it easy You can query the system catalog for stored procedures that reference the table in question Then you can capture the statistics on those stored procedures before and after you have created an index on the table and compare the results..

From the Site Actions menu, click the More Options link. Select the Custom List template and enter the name Defect Sources, as shown in Figure 3-24. Click the Create button to add the list.

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By default, the Application_Startup method creates the first page and assigns it to the Application.RootVisual property, ensuring that it becomes the top-level application element the visual core of your application:

private void Application_Startup(object sender, StartupEventArgs e) { this.RootVisual = new MainPage(); } Although you can change the root visual by adding or removing elements, you can t reassign the RootVisual property at a later time. After the application starts, this property is essentially read-only.

In order to gather the stats on your procedures or capture the queries executed against the objects, you can utilize SQL Server Profiler for access to that table, or you can query SYS.DM_EXEC_QUERY_STATS Dynamic Management View (DMV) and search for the queries that access those tables. Once you find the queries in the DMV, you can use the execution count along with total_elapsed_time and a series of other columns to quickly compute the average runtime of queries against the table. It doesn t matter if you use SYS.DM_EXEC_QUERY_STATS or the Profiler you should be able capture some statistics to use before and after the index creation on the table. Armed with information, go ahead and create the index that you plan to create, preferably in a test environment. For those who have good QA environments with load testing tools, then your environment may be a good place to verify that the index creation will not negatively affect the application. Set up your load testing tool to simulate a series of application functions, including the one that you plan on fixing with the addition of the new index. Hopefully, your tool will enable you to see the response times of all the queries giving you a good baseline. After you apply the index, re-run the test and compare your results. If the difference in response times is acceptable, then apply the index to your production environment and monitor your system. Monitor the averages of your queries to ensure their durations are acceptable to the application users. Monitor your indexes for as long as you need to make sure the performance is what you expected.

Figure 3-24. Adding the Defect Sources list Using the Add new item link, create several sources of defects. The view will look like Figure 3-25.

The Startup event passes in a StartupEventArgs object, which includes one additional detail: initialization parameters. This mechanism allows the page that hosts the Silverlight control to pass in custom information. This is particularly useful if you host the same Silverlight application on different pages, or you want the Silverlight application to vary based on userspecific or session-specific information. For example, you can customize the application s view depending on whether users are entering from the customer page or the employee page. Or, you may choose to load different information based on the product the user is currently viewing. Just remember that the initialization parameters come from the tags of the HTML entry page, and a malicious user can alter them.

Note One other useful DMV is SYS.DM_DB_INDEX_USAGE_STATS. This view allows you to see how often a newly created index is actually used. We cover useful dynamic management views in the following section.

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