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) While this sounds good in theory, the practical benefits can sometimes fall short of what theory might suggest You shouldn t even contemplate using a reader/writer lock unless you are seeing performance problems with a simpler monitor-based solution This kind of lock is more complex, and so it s quite possible you ll end up making things slower, particularly in cases where you weren t seeing much contention (The example we gave of a website with a message of the day is quite likely to fall into that category If the message is just a string, how long does it take to get hold of a reference to a string, really Even with hundreds of requests per second, the chances of contention are probably pretty small) It doesn t help that the first implementation offered by the NET Framework the ReaderWriterLock was, frankly, not very good.

If a user makes a query for past orders of pizzas with onions, submitting the form would result in an HTTP request for the URL: https://www.deliver-me-pizza.com/show_orders_by_topping topping=Onions which in turn results in the following SQL query to be constructed and executed: SELECT pizza, toppings, quantity, order_day FROM orders WHERE userid=4123 AND toppings LIKE '%Onions%' The LIKE operator specifies a textual match, with the % character used as a wildcard character (i.e., the condition matches all rows in which the toppings column contains the string Onions as a substring). Since the parameter topping is used in a context inside a quoted string, the attacker needs to inject additional single-quote characters to ensure that the resulting SQL statement after injection is syntactically correct. However, doing so is not difficult. For example, he could simply set the parameter topping to the following: brzfg%'; DROP table creditcards; -The resulting SQL statement after injection then becomes SELECT pizza, toppings, quantity, order_day FROM orders WHERE userid=4123 AND toppings LIKE '%brzfg%'; DROP table creditcards; --%' Here, the attacker has arranged for the SELECT clause to return an empty set by querying for a string that does not occur in the database (this isn t actually important in this particular attack, but might be necessary in a SELECT UNION attack). Furthermore, he has injected the SQL comment delimiter -- to prevent the % and ' characters at the end of the query from resulting in a syntax error. The other attacks introduced in this section (such as using SELECT UNION to retrieve data from other tables) can be adapted accordingly.

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Your monitor-based solution had to be in a world of pain before ReaderWriterLock looked preferable Unfortunately, some of the problems of this lock couldn t be fixed without risking breaking existing code, so NET 35 introduced a much better replacement, ReaderWriterLockSlim If you need reader/writer locking, you should use this newer variant unless you absolutely have to support older versions of NET Be aware that unlike ReaderWriterLock, ReaderWriter LockSlim implements IDisposable, so you need to arrange for it to be disposed at the right time This means that if you use it as an implementation detail of a class, your class will probably need to implement IDisposable too..

It can sometimes be useful to abandon a loop earlier than its natural end. In the case of a foreach loop, this might mean stopping before you ve processed every item in the collection. With for or while loops, you get to write the loop condition so that you can stop under whatever conditions you like, but it can sometimes be more convenient to put the code that makes a decision to abandon a loop somewhere inside the loop body rather than in the condition. For these eventualities, C# provides the break keyword.

We saw break already in a switch statement in Example 2-11 we used it to say that we re done with the switch and want to break out of that statement. The break keyword does the same thing in a loop:

using (StreamReader times = File.OpenText("LapTimes.txt")) { while (!times.EndOfStream) { string line = times.ReadLine(); if (line == "STOP!") { break; } double lapEndTime = double.Parse(line); Console.WriteLine(lapEndTime); } }

This is the loop from Example 2-16, modified to stop if it comes across a line in the input file that contains the text STOP! This breaks out immediately, abandoning the rest of the loop and leaping straight to the first line of code after the enclosing loop s closing brace. (In that case, this happens to be the enclosing using statement s closing brace, which will close the file handle.)

There are a variety of techniques that can be used together to prevent SQL injection. We recommend using them in combination as part of a defense-in-depth approach to preventing SQL injection attacks.

Now that all of the selections have been made, you can click the Preview button to see the final look and feel of your page. You can see the differences in style from the default page by comparing Figures 5-4 and 5-19.

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