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Also think about the implicit assumptions that your interface is introducing and throw exceptions when any assumption is violated If your type is going to be used in lots of different situations, designing an interface that meets all the possible scenarios will be impossible In this case, you must simply try your best and get feedback from users that you can take into account when designing the next version of your type s interface Implied Assumptions Developers Almost Never Think About When accessing any method, developers make several assumptions assumptions that we hardly ever think about When we call a method, we assume that there is enough stack space; we assume that there is enough memory for the method s IL code to be JIT compiled into native code; and we assume that no bug will occur within the CLR itself when attempting the call.

If you examine the Windows application log, you will find that the changes were audited there as well, as shown in Figure 4-1 . If you don t see the events in the Windows application log, make sure that it s not full or that you allow it to be recycled .

Although it happens rarely, these assumptions are sometimes violated As you write code to catch and deal with exceptions, keep in mind that these assumptions can be violated at any time, causing the CLR itself to throw a SystemStackOverflowException, a SystemOutOfMemoryException, or a SystemExecutionEngineException exception, respectively For example, imagine the following method:.

type="System.Data.SqlClient.SqlClientFactory, System.Data /> </DbProviderFactories> </system.data>

Caching is such a fundamental concept in object/relational persistence that you can t understand the performance, scalability, or transactional semantics of an ORM implementation without first knowing what kind of caching strategy (or strategies) it uses. There are three main types of cache:

/// <remarks/> public System.IAsyncResult BeginHelloWorld( string Language, System.AsyncCallback callback, object asyncState) { return this.BeginInvoke("HelloWorld", new object[] { Language}, callback, asyncState); }

4. 5. 6.

With this code, I am creating a TaskFactory<Int32> object that I will use to create three Task objects . I want four things: for each Task object to share the same CancellationTokenSource token, for all three tasks to be considered children of their parent, for all continue-with tasks created by the TaskFactory object to execute synchronously, and for all the Task objects created by this TaskFactory to use the default TaskScheduler . Then I create an array consisting of the three child Task objects, all created by calling TaskFactory s StartNew method . This method conveniently creates and starts each child task . In a loop, I tell each child task that throws an unhandled exception to cancel all the other child tasks that are still running . Finally, using the TaskFactory, I call ContinueWhenAll, which creates a Task that runs when all the child tasks have completed running . Since this task is created with the TaskFactory, it will also be considered a child of the parent task and it will execute synchronously using the default TaskScheduler . However, I want this task to run even if the other child tasks were canceled, so I override the TaskFactory s CancellationToken by passing in CancellationToken.None, which prevents this task from being cancelable at all . Finally, when the task that processes all the results is complete, I create another task that displays the highest value returned from all the child tasks . Note When calling TaskFactory s or TaskFactory<TResult> s static ContinueWhenAll

customerBill = PreviousBalance( paymentHistory[ customerID ] ) + LateCharge( paymentHistory[ customerID ] );

// This demonstrates Convert's range checking try { c = Convert.ToChar(70000); // Too big for 16 bits Console.WriteLine(c); // Doesn't execute } catch (OverflowException) { Console.WriteLine("Can't convert 70000 to a Char."); }

When it runs, your class welcomes prospective users to the Event Calendar. Now that you have all the necessary classes in place, you should run the build file. At the command line, change directories so that you re in the same directory as the build.xml file. Type the following at the command line:

In this chapter: Sample Data for This Tuning Methodology Tools for Query Tuning Index Tuning Preparing Sample Data 66 69 105 122 170

The use of master pages slightly changes how pages are processed and compiled. For one thing, a page based on a master has a double dependency on the .aspx source file (the content page) and on the .master file (the master page). If either of these pages changes, the dynamic page assembly will be recreated. Although the URL that users need is the URL of the content page, the page served to the browser results from the master page fleshed out with any replacement provided by the content page. Let s see in a bit more detail how a content page merges with the master page.