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Next, notice that the Thread type defines a property named Priority. By default, all threads have a priority level of Normal. However, you can change this at any point in the thread s lifetime using the ThreadPriority property and the related System.Threading.ThreadPriority enumeration: public enum ThreadPriority { Lowest, BelowNormal, Normal, // Default value. AboveNormal, Highest } If you were to assign a thread s priority level to a value other than the default (ThreadPriority.Normal), understand that you would have no direct control over when the thread scheduler switches between threads. In reality, a thread s priority level offers a hint to the CLR regarding the importance of the thread s activity. Thus, a thread with the value ThreadPriority.Highest is not necessarily guaranteed to be given the highest precedence. Again, if the thread scheduler is preoccupied with a given task (e.g., synchronizing an object, switching threads, or moving threads), the priority level will most likely be altered accordingly. However, all things being equal, the CLR will read these values and instruct the thread scheduler how to best allocate time slices. Threads with an identical thread priority should each receive the same amount of time to perform their work. In most cases, you will seldom (if ever) need to directly alter a thread s priority level. In theory, it is possible to jack up the priority level on a set of threads, thereby preventing lower-priority threads from executing at their required levels (so use caution).

When you wish to programmatically create additional threads to carry on some unit of work, you will follow a very predictable process:

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Create a method to be the entry point for the new thread. Create a new ParameterizedThreadStart (or ThreadStart) delegate, passing the address of the method defined in step 1 to the constructor. Create a Thread object, passing the ParameterizedThreadStart/ThreadStart delegate as a constructor argument. Establish any initial thread characteristics (name, priority, etc.). Call the Thread.Start() method. This starts the thread at the method referenced by the delegate created in step 2 as soon as possible.

2. 3. 4.

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As stated in step 2, you may make use of two distinct delegate types to point to the method that the secondary thread will execute. The ThreadStart delegate has been part of the System.Threading namespace since .NET 1.0, and it can point to any method that takes no arguments and returns nothing. This delegate can be helpful when the method is designed to simply run in the background without further interaction. The obvious limitation of ThreadStart is that you are unable to pass in parameters for processing. However, the ParameterizedThreadStart delegate type allows a single parameter of type System.Object. Given that anything can be represented as a System.Object, you can pass in any number of parameters via a custom class or structure. Do note, however, that the ParameterizedThreadStart delegate can only point to methods that return void.

To illustrate the process of building a multithreaded application (as well as to demonstrate the usefulness of doing so), assume you have a Console Application (SimpleMultiThreadApp) that allows the end user to choose whether the application will perform its duties using the single primary thread or split its workload using two separate threads of execution. Assuming you have imported the System.Threading namespace, your first step is to define a method to perform the work of the (possible) secondary thread. To keep focused on the mechanics of building multithreaded programs, this method will simply print out a sequence of numbers to the console window, pausing for approximately two seconds with each pass. Here is the full definition of the Printer class: public class Printer { public void PrintNumbers() { // Display Thread info. Console.WriteLine("-> {0} is executing PrintNumbers()", Thread.CurrentThread.Name); // Print out numbers. Console.Write("Your numbers: "); for(int i = 0; i < 10; i++) { Console.Write("{0}, ", i); Thread.Sleep(2000); } Console.WriteLine(); } } Now, within Main(), you will first prompt the user to determine whether one or two threads will be used to perform the application s work. If the user requests a single thread, you will simply invoke the PrintNumbers() method within the primary thread. However, if the user specifies two threads, you will create a ThreadStart delegate that points to PrintNumbers(), pass this delegate object into the constructor of a new Thread object, and call Start() to inform the CLR this thread is ready for processing.