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It does prevent the injection attack via the topping parameter, which relies on the attacker being able to inject a quote character to break out of the context of the string literal in the query However, while the method does eliminate quote characters, it is not a comprehensive approach to preventing SQL injection attacks There are many limitations that prevent such a simple solution from being effective For instance, it does not prevent SQL injection in which semicolons can be used to provide additional commands to run in an attack string One might suggest that if quotes and semicolons are blacklisted, then the attack might be foiled You might also think about eliminating whitespace characters as well but might there exist some additional characters that are dangerous If you forget to blacklist just one type of dangerous character, it could give rise to a successful attack.

AutoResetEvent can be problematic. There isn t necessarily any corre-

spondence between the number of times you signal it and the number of times it releases threads. If you signal it twice in a row when no threads are waiting, it doesn t keep count it s just as signaled after the second signal as it was after the first one. This can lead to bugs where you occasionally miss signals, and your code can grind to a halt. Approach with caution.

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These types are wrappers around the underlying Windows event synchronization primitive, so as with Mutex, you can use events for cross-process coordination. And of course, this also means that you incur the cost of getting the OS scheduler involved. .NET 4 introduces an alternative called ManualResetEventSlim. This will use busywaiting techniques similar to a spinlock for short waits. So just like the Monitor, it gets the scheduler involved only when a wait is necessary. Therefore, unless you really need the extra features available from the nonslim version (e.g., you need cross-process synchronization) the ManualResetEventSlim class is a better choice than ManualResetE vent if you re using .NET 4 or later.

.NET 4 introduces the CountdownEvent class, which provides a handy solution to a fairly common problem: knowing when you re done. Remember back in Example 16-6, we ran into an issue with the thread pool. We queued up a couple of pieces of work, but we had no way of knowing when they were done. One solution to that would be to use the Task Parallel Library, which we ll get to shortly, but an alternative would have been to use the CountdownEvent class.

if you know how many pieces of work there will be up front, you can pass that number into the constructor). For each piece of work that completes you call Signal. And if you need to wait for all outstanding work to complete (e.g., before your program exits), just call Wait.

In addition, an SQL injection that uses parameters with numeric values, such as the month parameter in the query at the beginning of the previous section, would not be prevented by blacklisting characters Since numeric constants in an SQL query are not delimited by quotes (or other characters), the attacker doesn t need to inject any quote character to execute an attack Hence, applying kill_quotes() to the input will not prevent the attack Besides that, blacklisting characters may also conflict with the functional requirements for your application For example, if your application stores your users names in the database at the time they sign up for an account, you might prevent a user named, say, O Brien, from correctly entering his name We now discuss some more robust solutions to preventing SQL injection than just simply attempting to blacklist certain dangerous characters that might give rise to attacks..

The System.Collections.Concurrent namespace provides various collection classes that are designed to be used in multithreaded environments. They look a little different from the normal collection classes because they are designed to be used without needing any locking, which means they can t offer features that rely on things staying consistent from one moment to the next. Numerical indexing is out, for example, because the number of items in the collection may change, as we saw when trying to use List<T> in a multithreaded fashion in Example 16-11. So these are not thread-safe versions of normal collection classes they are collections whose APIs are designed to support multithreaded use without the caller needing to use locks.

There are four table types to choose from: Color, Title and color, No column titles, and Basic. Click each table type to see what it looks like in the preview area. I want to display two mashups, one on top of the other. So I ll set the number of columns to 1 and the number of rows to 2. Click OK to show the new table in Zone 2; see Figure 5-21. Insert the cursor above the table, and type My Mashups. Increase the font size, and bold the text.

BlockingCollection is not just a multithreaded collection; it also offers associated co-

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