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private void cmdFind_Click(object sender, EventArgs e) { this.UseWaitCursor = true; txtResults.Text = ""; lblTimeTaken.Text = ""; // Get the search range. int from, to; if (!Int32.TryParse(txtFrom.Text, out from)) { MessageBox.Show("Invalid From value."); return; } if (!Int32.TryParse(txtTo.Text, out to)) { MessageBox.Show("Invalid To value."); return; } // Start the search for primes and wait. DateTime startTime = DateTime.Now; int[] primes = Worker.FindPrimes(from, to); // Display the time for the call to complete. lblTimeTaken.Text = DateTime.Now.Subtract(startTime).TotalSeconds.ToString(); // 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(" "); } txtResults.Text = sb.ToString(); this.UseWaitCursor = false; } This code runs without a hitch, but it also locks the user out while the work is in progress. If you start dragging the form around the screen while the Worker is searching for primes, you may see some erratic behavior. For example, the window may become a blank surface, indicating that the form hasn t yet responded to the Windows message asking it to repaint itself, or it may display the Not Responding message in the caption (see Figure 20-3). To improve on this situation, you need multithreading.

_stopwatch.Start(); // Do the task... _stopwatch.Stop(); MessageBox.Show(_stopwatch.Elapsed.TotalSeconds.ToString () + " seconds"); This code StopWatch.Elapsed.TotalSeconds property can be used to retrieve the elapsed time. This will be displayed in the following format:

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There s a principle in diagnosing and identifying problems in application code that is worth repeating here before we get into the profiling tools you ll be using. When you see the results of a profiler trace, you ll be presented with information that will show you an application block broken down into how many times a function (or SQL statement) was called, and how long the function call took to complete. It is extremely easy to fall into the trap of overoptimizing a piece of application code, simply because you have the diagnostic tools that show you what s going on in your code. This is especially true for PHP programmers who see the function call stack for their pages and want to optimize every single function call in their application. Basically, the rule of thumb is to start with the block of code that is taking the longest time to execute or is consuming the most resources. Spend your time identifying and fixing those parts of your application code that will have noticeable impact for your users. Don t waste your precious time optimizing a function call that executes in 4 milliseconds just to get the time down to 2 milliseconds. It s just not worth it, unless that function is called so often that it makes a difference to your users. Your time is much better spent going after the big fish. That said, if you do identify a way to make your code faster, by all means document it and use that knowledge in your future coding. If time permits, perhaps think about refactoring older code bases with your newfound knowledge. But always take into account the value of your time in doing so versus the benefits, in real time, to the user.

There are several ways to translate this example into a multithreaded application. Using asynchronous delegates, you can launch the Worker.FindPrimes() method on another thread. However, a much better approach is to wrap the call to Worker.FindPrimes() with another method in the form. This allows you to separate the code for updating the user interface from the code that actually performs the prime-number search, which is a key design goal. It also provides you with an extra layer of flexibility. This extra layer comes in handy if the signature of the FindPrimes() method changes. Figure 20-4 shows this design.

The host grant table stores entries that are used when the db grant table does not have adequate information to process the privilege verification request (see Figure 15-2) Neither the GRANT nor REVOKE statements affect entries in mysqlhost Entries must be added and removed manually The host grant table has an almost identical schema to the db grant table, except it does not have a User column When a statement request is evaluated by the access control system, and it comes to the database grant level (meaning the user s global privileges were insufficient to grant the request and the object requiring privileges is of a database scope level or below), the access control system checks to see if there is an entry in mysqldb for the supplied user If one is found, and the Host column value is blank (not '%', which means any database) then mysql.

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