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The final touch is seeing what is rendered in a page that hosts the AjaxLogin control; see figure 9.15. The following code was extracted from such a web page:

Debugging the Basic Service After you test and debug your general logic, you can start debugging your code while running as a service All your initial debugging should take place on a system on which you can control everything Ideally, you should have a second machine sitting right next to your main development machine that you can use for your initial debugging The second machine should have the version and flavor of Windows you're recommending to your customers for the environment your service will run under Whereas the reason for debugging the core code was to verify your basic logic, the reason for preliminary service debugging is to shake out your basic service-specific code You need to complete four tasks as part of debugging your first-cut service code: Turn on Allow Service To Interact With Desktop Set your service identity Attach to your service Debug your startup code.

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Throwing null reference or other exceptions inside the Loaded events of controls or user controls. This happens when you make assumptions about the state of the control that might be true at run time but are not true at design time. Attempting to access the Application or Application.Current object at design time. Consuming a StaticResource in WPF UserControls. Creating very large projects.

namespace Example_20_1_ _ _ _ADO.NET { class Program { static void Main(string[] args) { // create the data connection string connectionString = "server=.\\sqlexpress; Trusted_Connection=yes;database=Northwind"; // create the string to hold the SQL command // to get records from the Customers table string commandString = "Select CompanyName, ContactName from Customers"; // create the data adapter with the // connection string and command SqlDataAdapter myDataAdapter = new SqlDataAdapter(commandString, connectionString); // Create and fill the DataSet object DataSet myDataSet = new DataSet( ); myDataAdapter.Fill(myDataSet); // Retrieve the Customers table DataTable myDataTable = myDataSet.Tables[0]; // iterate over the rows collection and output the fields foreach (DataRow dataRow in myDataTable.Rows)

As I discuss each task, I'll mention particular issues relevant to the different technologies as appropriate Turn On Allow Service To Interact With Desktop No matter what type of service you're debugging, you'll want to turn on Allow Service To Interact With Desktop on the Log On tab of your service's Properties dialog box Although you shouldn't have any user interface elements with your service, having assertion notifications that allow you to gain control with the debugger is very helpful Assertion notifications combined with excellent logging code, such as the code that ATL gives you for writing to the event log, can make it much easier to debug services In the initial stages of development, I turn on SUPERASSERT dialog assertions just so that I can quickly gauge the general health of my code (For more information on SUPERASSERT, see 3.

}

When we measured execution speed, we could do so either in JavaScript code using the Date object or with an external tool. JavaScript doesn t provide any built-in capabilities to read system memory usage, so we re dependent on external tools. Fortunately, we have several to choose from. There are a variety of ways to see how much memory your browser is consuming during execution of your application. The simplest way to do so is to use a system utility appropriate to your operating system to see the underlying processes. On Windows systems, there is the Task Manager, and UNIX systems have the console-based top command. Let s look at each of these in turn. Windows Task Manager The Windows Task Manager (figure 8.5) is available on many versions of Windows (Windows 95 and 98 users are out of luck here). It provides a view of all processes running in the operating system and their resource use. It can usually be invoked

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