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Here s the form method that you need. It simply calls the Worker.FindPrimes() method (synchronously), and then updates the user interface with the results. private void CallAsyncWorker(int from, int to) { // Start the search for primes and wait. DateTime startTime = DateTime.Now; int[] primes = Worker.FindPrimes(from, to); // (Update the user interface.) } Because you re calling the CallAsyncWorker() method asynchronously, you need to create a delegate for it that has the same signature: private delegate void CallAsyncWorkerDelegate(int from, int to); Now you can invoke the CallAsyncWorker() method on another thread when the user clicks the Find Primes button. Here s the code you need: private void cmdFind_Click(object sender, EventArgs e) { // Disable the button. cmdFind.Enabled = false; 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 on another thread. CallAsyncWorkerDelegate doWork = new CallAsyncWorkerDelegate(CallAsyncWorker); doWork.BeginInvoke(from, to, null, null); } Notice that this example disables the button so that only one asynchronous operation can be performed at a time. The button will be re-enabled when the asynchronous task is completed.

Take note that if you attempt to use the same StopWatch instance again after you have timed an event, you will need to call the StopWatch.Reset method to reset the total elapsed time internally stored in the object, as illustrated here:

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This example leaves out one detail the code for updating the user interface The problem is that NET controls exhibit thread affinity, which means that their properties and methods can be called only by code running on the same thread that created the control As a result, you can t modify the lblTimeTaken or txtResults controls from the CallAsyncWorker() method A new debugging feature in NET 20 helps you spot threading errors By default, every Windows control included with NET throws an InvalidOperationException when it s accessed from the wrong thread (You can disable this behavior by setting the static ControlCheckForIllegalCrossThreadCalls to false) However, it s important to realize that this is a debugging convenience, and these checks aren t made in a release-mode build Furthermore, third-party controls are unlikely to provide the same nicety.

host is consulted for further information If an entry is found in mysqlhost for the supplied Host value in the identification label, then the privileges contained in both mysqldb and mysqlhost are combined (with a logical AND expression) to determine if the request should be granted So, why would you even bother using the host table That s a good question Most database administrators never even touch it Many don t even know it exists, and if they do, they don t know why it s there The primary reason that mysqlhost was added to the grant table mix was to provide database administrators the ability to grant or deny access requests coming from certain hosts or domains, regardless of the username Remember that the MySQL access control system is not denial-based.

Stopwatch _stopwatch = new Stopwatch();

As a result, you need to be conscious of when you cross a thread boundary If you do access a control from another thread, you will run into unpredictable errors that can crash your application or freeze your user interface Worst of all, these types of errors happen sporadically, which makes them very difficult to diagnose Fortunately, all NET controls provide two members that you can access from other threads These include: InvokeRequired This property returns true if the current code is running on a thread other than the one that created the control, in which case you can t directly manipulate the control Invoke() This method allows you to fire a method on the correct user interface thread, so you can manipulate the control without causing an error You can use the Invoke() method to solve the problem in the current example.

It uses an OR-based system to search for any granted level of needed privilege, instead of searching first for the explicit denial of that privilege..

You just need to break your code down so that the user interface update happens in a separate method Here s an UpdateForm() method you could use for updating the interface (with the corresponding delegate): private delegate void UpdateFormDelegate(TimeSpan timeTaken, string primeList); private void UpdateForm(TimeSpan timeTaken, string primeList) { lblTimeTakenText = timeTakenTotalSecondsToString(); txtResultsText = primeList; cmdFindEnabled = true; } Now you can call the UpdateForm() method from the CallAsyncWorker() method using ControlInvoke() Here s how you need to revise the code: private void CallAsyncWorker(int from, int to) { // Start the search for primes and wait DateTime startTime = DateTimeNow; int[] primes = WorkerFindPrimes(from, to);.

_stopwatch.Start(); // Do first task ... _stopwatch.Stop(); _stopwatch.Reset(); _stopwatch.Start(); //Do second task ... _stopwatch.Stop();

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