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As all programmers know, there are several ways to solve most problems. In keeping with this principle, .NET provides several tools for multithreaded programming. Each approach has its own strengths and weaknesses. Your options include the following: Asynchronous delegate calls. The delegate type has built-in support for asynchronous use. That means you can launch any method on a separate thread. The code runs on one of the free threads that the common language runtime (CLR) reserves in a handy thread pool. This approach is straightforward and convenient. The BackgroundWorker component. It s easy enough to get code to run on a separate thread, but it s not as easy to manage threading issues such as synchronization. To help you avoid these challenges, .NET 2.0 introduces a new higher-level model with the BackgroundWorker component, which allows you to write multithreaded code just by responding to a couple of events that fire when the task starts and when it finishes. This approach is the simplest, but also the least flexible.

The ODP.NET performance counters are a set of counters that tell you the number of connections active, closed, and so on at any point in time. This tool allows you, for example, to detect connection leaks where your code unintentionally leaves database connections unclosed. For example, you might run a particular function in your application, check the total number of new connections, and then cross-check that with the number of connections closed. If the numbers do not match over repeated experimentation, you can conclude you have a connection leak. You can also hook these performance counters up to the Windows Reliability and Performance Monitor, which allows you to visualize different aspects of database performance as a set of time graphs. You could, for instance use, them to analyze correlations between CPU and database utilization peaks by overlaying different charts together.

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The System.Threading.Thread class. For more control, you can spawn a new thread at will by creating a Thread object. The Thread object is tied to a single method, which it launches when you call Thread.Start(). When the method ends, the thread is destroyed. This approach is the most powerful, but it also requires the most work to implement. These three approaches differ in how they are implemented by the CLR, how you write your code, and what features are available. A serious .NET programmer needs to be familiar with all three. In the rest of this chapter, you ll work through examples that put all three of these techniques to the test. Along the way, you ll develop a simple asynchronous application, making it increasingly more sophisticated (and more complex).

Clients can connect to a MySQL server in numerous ways. Regardless of the client or API used to connect, MySQL executes the same authentication procedures to authorize the incoming requests. Even so, it is possible through the use of option files, to configure clients to send a default host, username, and password along with each connection. This is done by altering the MySQL configuration file (described in 14) and inserting one or more of the following entries under the [client] configuration section: host=hostname user=username password=your_pass Setting a default password for the MySQL client is not a secure practice, and should not be done on anything but test or development servers that do not have any sensitive data. Also be aware that, by default, MySQL accepts connections from anonymous users; that is, MySQL allows connections that do not supply a username. Though the default access of this anonymous user is limited, and only the test database can be accessed, it is still a security threat, as discussed in 16.

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