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To begin, set a reference to the System.Windows.Forms.dll assembly and display a message within Main() using MessageBox.Show() (you ll see the point of doing so once you run the program). Here is the complete implementation of Main(): static void Main(string[] args) { Console.WriteLine("***** The Amazing Thread App *****\n"); Console.Write("Do you want [1] or [2] threads "); string threadCount = Console.ReadLine(); // Name the current thread. Thread primaryThread = Thread.CurrentThread; primaryThread.Name = "Primary"; // Display Thread info. Console.WriteLine("-> {0} is executing Main()", Thread.CurrentThread.Name); // Make worker class. Printer p = new Printer(); switch(threadCount) { case "2": // Now make the thread. Thread backgroundThread = new Thread(new ThreadStart(p.PrintNumbers)); backgroundThread.Name = "Secondary"; backgroundThread.Start(); break; case "1": p.PrintNumbers(); break; default: Console.WriteLine("I don't know what you want...you get 1 thread."); goto case "1"; } // Do some additional work. MessageBox.Show("I'm busy!", "Work on main thread..."); Console.ReadLine(); } Now, if you run this program with a single thread, you will find that the final message box will not display the message until the entire sequence of numbers has printed to the console. As you are explicitly pausing for approximately two seconds after each number is printed, this will result in a less-than-stellar end user experience. However, if you select two threads, the message box displays instantly, given that a unique Thread object is responsible for printing out the numbers to the console (see Figure 14-7).

We can test our cEmployee class using the Immediate window in the VBE: 1. Open the Immediate window by choosing View Immediate Window or by pressing the Ctrl+G key combination. 2. In the Immediate window, type - Set emp = New cEmployee, and press Enter. 3. Type - emp.Name and press Enter. Your screen should look like Figure 1-30.

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Before we move on, it is important to note that when you build multithreaded applications (which includes the use of asynchronous delegates) on single CPU machines, you do not end up with an application that runs any faster, as that is a function of a machine s CPU. When running this application using either one or two threads, the numbers are still displaying at the same pace. In reality, multithreaded applications result in more responsive applications. To the end user, it may appear that the program is faster, but this is not the case. Threads have no power to make foreach loops execute quicker, to make paper print faster, or to force numbers to be added together at rocket speed. Multithreaded applications simply allow multiple threads to share the workload.

Recall that the ThreadStart delegate can point only to methods that return void and take no arguments. While this may fit the bill in many cases, if you wish to pass data to the method executing on the secondary thread, you will need to make use of the ParameterizedThreadStart delegate type. To illustrate, let s re-create the logic of the AsyncCallbackDelegate project created earlier in this chapter, this time making use of the ParameterizedThreadStart delegate type. To begin, create a new console application named AddWithThreads and use the System.Threading namespace. Now, given that ParameterizedThreadStart can point to any method taking a System. Object parameter, you will create a custom type containing the numbers to be added: class AddParams { public int a; public int b; public AddParams(int numb1, int numb2) { a = numb1; b = numb2; } } Next, create a static method in the Program class that will take an AddParams type and print out the summation of each value:

public static void Add(object data) { if (data is AddParams) { Console.WriteLine("ID of thread in Main(): {0}", Thread.CurrentThread.GetHashCode()); AddParams ap = (AddParams)data; Console.WriteLine("{0} + {1} is {2}", ap.a, ap.b, ap.a + ap.b); } } The code within Main() is straightforward. Simply use ParameterizedThreadStart rather than ThreadStart: static void Main(string[] args) { Console.WriteLine("***** Adding with Thread objects *****"); Console.WriteLine("ID of thread in Main(): {0}", Thread.CurrentThread.GetHashCode()); AddParams ap = new AddParams(10, 10); Thread t = new Thread(new ParameterizedThreadStart(Add)); t.Start(ap); ... }

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