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model if you want to use multiple threads per request, but for straightforward scenarios the single-threaded style is best.) So although the web application as a whole is able to run multiple concurrent threads, those threads don t interact. This approach requires some discipline. There s nothing in .NET that enforces isolation you simply have to choose not to share data between threads. In a web application, that s relatively easy because HTTP naturally discourages stateful communications, although if you start using caching techniques to improve performance, you lose some isolation because all your requests will end up using shared objects in your cache. And any information in a static field (or any object reachable directly or indirectly from a static field) is potentially shared. Chances are good that most multithreaded applications will have at least some information that needs to be accessed by several threads, so complete isolation may not be realistic. But maximizing isolation is a good idea keeping as much information as possible local to individual threads means not having to worry about concurrency hazards for any of that information.

However, if Alice s ATM card and PIN were stolen by a bad guy who is trying to withdraw money, then taking Alice s location (or specifically, the location of her cell phone) into account could help thwart such a fraudulent withdrawal request If Alice s cell phone is still in her possession, when an attacker attempts to use her card at an ATM, the location of the ATM will not correspond to the location of Alice s cell phone, and the bank will deny the withdrawal request (unless, of course, Alice and her cell phone are being held captive in front of the ATM) In this example, it is advantageous for Alice to keep her cell phone and her ATM card in different places; she should not, say, keep both of them in her purse..

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When you really have to share data, you can often avoid many concurrency hazards by sharing only immutable data, that is, data that cannot be altered. Fields marked with readonly cannot be modified after construction the C# compiler enforces this so you don t have to worry about whether those fields are being changed by other threads as you try to use them. You need to be careful, though readonly applies only to the field itself, and not the object the field refers to if it s a reference type. (And even if the field is a value type, if that value itself contains fields of reference types, the objects being referred to are not affected by readonly.) So as with isolation, this is an option that requires some discipline.

If you re writing multithreaded code, sooner or later you will probably need to have at least some information that is accessible to multiple threads, and which occasionally needs to be changed isolation and immutability are sometimes simply not options. In this case, you ll need to synchronize access to the data for example, anytime shared information is being modified, you ll need to make sure no other threads are trying to read or write that information. This requires the most discipline of any of the solutions described here, and is likely to be the most complex, but it offers the most flexibility. The .NET Framework provides a wide range of features to help you synchronize the way your threads access shared information, and these are the topic of the next section.

.NET does have an isolation mechanism: you can divide code into so-called appdomains. But this adds its own complications and is designed for slightly more coarse-grained divisions, and it s really not well suited to this problem. ASP.NET can use this to isolate multiple web applications sharing a process, but does not use it to isolate individual requests.

There are two important ways in which the operations of multiple threads may need to be coordinated. When you have shared modifiable data, it needs to be possible to make threads take it in turns to access that data. But it s also often important for threads to be able to discover when something has happened a thread might want to enter a blocking state until such time as it has useful work to do, for example. So some synchronization primitives provide notification rather than exclusive access. Some offer a combination of the two.

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