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// Calculate the time for the call to complete. TimeSpan timeTaken = DateTime.Now.Subtract(startTime); // Paste the list of primes together into one long string. StringBuilder sb = new StringBuilder(); foreach (int prime in primes) { sb.Append(prime.ToString()); sb.Append(" "); } // Use the Control.Invoke() method of the current form, // which is owned by the same thread as the rest of the controls. this.Invoke(new UpdateFormDelegate(UpdateForm), new object[] {timeTaken, sb.ToString()} ); } The nice part about the Invoke() method is that it supports methods with any signature. All you need to do is pass a delegate and supply an object array with all the parameter values. Notice that the CallAsyncWorker() method also performs the work of building the string of primes. That s because the UpdateForm() method fires on the user interface thread (when it s idle), temporarily interrupting your application. To ensure that the application remains responsive, you need to reduce the amount of work you perform here as much as possible. This completes the example. Figure 20-5 shows the three steps. First the button is clicked, launching the event handler (step 1). Next, the CallAsyncWorker() is invoked asynchronously (step 2), and it calls the FindPrimes() method (step 3). Finally, CallAsyncWorker() retrieves the result and calls the UpdateForm() method on the user interface thread (step 4). Steps 1 and 4 are on the user interface thread, while the shaded portion (steps 2 and 3) execute on a single thread borrowed from the CLR s thread pool.

2. MySQL doesn t actually use the FIND_IN_SET() function, but rather does a bitwise & operation on the privileges loaded into memory for the queried user. We use the FIND_IN_SET() function here to demonstrate the concept.

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To test this example, run the application and start a prime search. While it s underway, you still can click on other controls, and drag the form around the screen. Of course, to prevent synchronization problems or unintended side effects, you need to make sure your user interface is in a state where only the supported commands are available. For example, the Find Primes button is disabled in this example because we ve chosen to allow only one search at a time. If you like, you can rewrite UpdateForm() method to make it self-sufficient, so that it automatically marshals itself to the user interface thread as needed. This is a common pattern in Windows Forms applications that s easy to implement. private void UpdateForm(TimeSpan timeTaken, string primeList) { if (this.InvokeRequired) { this.Invoke(new UpdateFormDelegate(UpdateForm), new object[] {timeTaken, primeList} ); } else { lblTimeTaken.Text = timeTaken.TotalSeconds.ToString(); txtResults.Text = primeList; cmdFind.Enabled = true; } } Now you can call UpdateFormDelegate() directly. If you call UpdateFormDelegate() from the user interface thread, the code will run ordinarily. If you call it from another thread, the method will call itself on the correct thread, taking care of the marshalling automatically.

Tip When measuring performance, it is usually not a good idea to take the measurement on the first run of the test code. When you run your code for the first time, you may have a lot of background-level loading, caching, and initialization going on, and all this can contribute to a larger time delta. A single, off-target measurement can drastically affect the measured average and produce inaccurate results.

However, there are times when it is necessary to create what are known as stop lists, or lists of items to which access specifically is denied. mysql.host can be used to create just such lists for domains, regardless of the user part of the identification label. Let s say we have three server hosts in our network: sales.example.com, intranet.example.com, and public.example.com. Of these, the only server that we don t want to have access to any databases is public.example.com, as it poses a security risk. So, we run the following code: mysql> mysql> -> -> -> INSERT INTO mysql.host SET Host='public.example.com', Db='%'; INSERT INTO mysql.host SET Host='%.example.com', Db='%' , Select_priv='Y', Insert_priv='Y', Update_priv='Y', Delete_priv='Y' , Create_priv='Y', Drop_priv='Y', Index_priv='Y',Alter_priv='Y' , Create_tmp_table_priv='Y';

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