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Single-threaded asynchronous code is more complex than sequential code, of course, so there s still scope for trouble. For example, you need to be careful that you don t attempt to set multiple asynchronous operations in flight simultaneously that might conflict. Also, components that implement this pattern call you back on the right thread only if you use them from the right thread in the first place if you use a mixture of this pattern and other multithreading mechanisms, be aware that operations you kick off from worker threads will not complete on the UI thread.

There are two optional features of the event-based asynchronous model. Some classes also offer progress change notification events, such as the WebClient class s Download ProgressChanged event. (Such events are also raised on the original thread.) And there may be cancellation support. For example, WebClient offers a CancelAsync method.

Click inside the top part of the table to select that area. Click the Mashup button to show the available mashups. Select My Photo Mashup from the My Shared Mashups list; see Figure 5-24 (note that mashups on a web page must be shared). Click inside the bottom part of the table. If text is there, select and delete it. Select My UpComing Mashup to insert it. Both mashups will be displayed.

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There s no fundamental need for code to use either the APM or the event-based asynchronous pattern. These are just conventions. You will occasionally come across code that uses its own unusual solution for asynchronous operation. This can happen when the design of the code in question is constrained by external influences for example, the System.Threading namespace defines an Overlapped class that provides a managed representation of a Win32 asynchronous mechanism. Win32 does not have any direct equivalent to either of the .NET asynchronous patterns, and just tends to use function pointers for callbacks. .NET s Overlapped class mimics this by accepting a delegate as an argument to a method. Conceptually, this isn t very different from the APM, it just happens not to conform exactly to the pattern. The standard asynchronous patterns are useful, but they are somewhat low-level. If you need to coordinate multiple operations, they leave you with a lot of work to do, particularly when it comes to robust error handling or cancellation. The Task Parallel Library provides a more comprehensive scheme for working with multiple concurrent operations.

.NET 4 introduces the Task Parallel Library (TPL), a set of classes in the System.Thread ing.Tasks namespace that help coordinate concurrent work. In some respects, the TPL superficially resembles the thread pool, in that you submit small work items (or tasks) and the TPL will take care of working out how many threads to use at once in order to run your work. But the TPL provides various services not available through direct use of the thread pool, especially in the areas of error handling, cancellation, and managing relationships between tasks.

Why does the attacker need to choose the username to be admin' -- for the attack to work Note that if the username the attacker attempts to choose is simply admin, there would be a name collision since that username is already taken by the real administrator Also, if the attacker chooses admin', the SQL statement will result in an error because of the trailing quote The extra double-hyphen (--) characters are required for the attack to be successful such that the trailing quote is interpreted as a comment..

You can associate tasks with one another for example, tasks can have a parent-child relationship, which provides a way to wait until all of the tasks related to some higherlevel operation are complete. You can also arrange for the completion of one task to kick off another related task. Error handling gets tricky with asynchronous and concurrent code what do you do if you ve built an operation out of 20 related concurrent tasks, and just one of them fails while the rest are either in progress, already complete, or not yet started The TPL provides a system for bringing work to an orderly halt, and collecting in a single place all of the errors that occurred. The mechanisms required to halt work in the event of an error are also useful if you want to be able to stop work in progress for some other reason, such as when the user clicks a Cancel button. We ll start by looking at the most important concept in the TPL, which is, unsurprisingly, the task.

A string is an ordered sequence of characters:

We start with the first character, which is W. Then we continue on in order from left to right:

'W', 'e', ' ', 'c', 'o', 'u', 'l', 'd'

And so on. A string doesn t have to be a whole sentence, of course, or even anything meaningful. Any ordered sequence of characters is a string. Notice that each character might be an uppercase letter, lowercase letter, space, punctuation mark, number (or, in fact, any other textual symbol). It doesn t even have to be an English letter. It could be Arabic, for example:

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