[sourav12rav]

How to create a thread in C#.net as well as multi threading

[digioz]

Take a look at this MSDN Article on Threading:

Threading Tutorial (C#)

Pete

[urstop]

You can use the classes from the System.Threading namespace to create a multithreaded application.

[BurkeFour]

Using the Thread Pool is quick and easy...be careful though, as there are limited numbers of threads per processor.

[David Edward]

Any Windows application must have one or more processes. A Process is structural unit with a memory block and using some set of resources. For each executable, the Windows operating system creates some isolated memory block. This C# .Net Tutorial tries to explain the basics of Multithreading in C# .Net.

Every process must have at least one thread. The first thread is created with a process and is known as primary thread. This Primary Thread is entry point of application. In traditional Windows applications it is the method WinMain() and in console applications it is named main().

Main goal of creating multithreading application is performance improvement. As an example, imagine a situation where in a user starts a long process (e.g. copying), he can?t use a single threaded application and wait for an infinite time for the operation to get completed. But if he uses multi?threading application he can set copying process in the background and interact with application without any problems.



At first, if one wants to create a multi-threaded application an important point to be remembered is, a global variable, which is being accessed by different threads, can try to modify the same variable. This is a generic problem, which is solved using a mechanism called Synchronization of threads. Synchronization is nothing but the process of creating some set of rules to operate data or resources.

The C# .Net language has a powerful namespace which can be used for programming with Threads as well as Thread Synchronization in C# .Net programming. The name of the namespace is Sytem.Threading. The most important class inside this namespace for manipulating the threads is the C# .Net class Thread. It can run other thread in our application process.
Sample program on C# Multithreading - C# Tutorial:

The example it creates an additional C# .Net class Launcher. It has only one method, which output countdown in the console.

Code:

//Sample for C# tutorial on Multithreading using lock

    public void Coundown()
    {

        lock(this)
        {

            for(int i=4;i>=0;i--)
            {

                Console.WriteLine("{0} seconds to start",i);

            }

            Console.WriteLine("GO!!!!!");

        }

    }

There is a new keyword lock inside the above chunk of .Net C# tutorial code. This provides a mechanism for synchronizing the thread operation. It means at the same point of time only one thread can access to this method of created object. Unless the lock is released after completion of the code, the next routine or iteration cannot enter the block.

To understand it more clearly please have a look at the piece of main method?s code:

Code:

    Launcher la = new Launcher();

    Thread firstThread = new Thread(new ThreadStart(la.Coundown));
    Thread secondThread =new Thread(new ThreadStart(la.Coundown));
    Thread thirdThread = new Thread(new ThreadStart(la.Coundown));

    firstThread.Start();
    secondThread.Start();
    thirdThread.Start();

As you see there were created three additional threads. These threads start a method of object that has Launcher type. The above program is a very simple example of using multi-threading in C#. Net. But C# .Net allows us to create more powerful applications with any level of complexity.

At last a few words about attached example. It can be compiled using Microsoft .NET command line. Just type csc filename.cs. After it CSC compiler creates an executable version of your code, since it can be run as standard exe file.

[Yeroon]

Here you can find a simple sample:

Where can I find sample C# code for simple threading? - C# Frequently Asked Questions - Site Home - MSDN Blogs

Please note that if you want to use this with ASP.net you should confirm that your host allows you to start separate threads. Many only allow the current thread the web app is running in

[anilalogix@gmail.com]

To learn more abt Multithreading in C#(Synchronization primitives,Do’s and Dont’s etc)

Click here :
Multithreading in C#

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[dynamicdreamz1]

This example demonstrates how to create and start a thread, and shows the interaction between two threads running simultaneously within the same process. Note that you don't have to stop or free the thread. This is done automatically by the .NET Framework common language runtime.

Code:

// StopJoin.cs
using System;
using System.Threading;

public class Alpha
{

   // This method that will be called when the thread is started
   public void Beta()
   {
      while (true)
      {
         Console.WriteLine("Alpha.Beta is running in its own thread.");
      }
   }
};

public class Simple
{
   public static int Main()
   {
      Console.WriteLine("Thread Start/Stop/Join Sample");
      
      Alpha oAlpha = new Alpha();

      // Create the thread object, passing in the Alpha.Beta method
      // via a ThreadStart delegate. This does not start the thread.
      Thread oThread = new Thread(new ThreadStart(oAlpha.Beta));

      // Start the thread
      oThread.Start();

      // Spin for a while waiting for the started thread to become
      // alive:
      while (!oThread.IsAlive);
      
      // Put the Main thread to sleep for 1 millisecond to allow oThread
      // to do some work:
      Thread.Sleep(1);
      
      // Request that oThread be stopped
      oThread.Abort();
      
      // Wait until oThread finishes. Join also has overloads
      // that take a millisecond interval or a TimeSpan object.
      oThread.Join();
      
      Console.WriteLine();
      Console.WriteLine("Alpha.Beta has finished");
      
      try 
      {
         Console.WriteLine("Try to restart the Alpha.Beta thread");
         oThread.Start();
      }
      catch (ThreadStateException) 
      {
         Console.Write("ThreadStateException trying to restart Alpha.Beta. ");
         Console.WriteLine("Expected since aborted threads cannot be restarted.");
      }
      return 0;
   }
}

Output:

Thread Start/Stop/Join Sample
Alpha.Beta is running in its own thread.
Alpha.Beta is running in its own thread.
Alpha.Beta is running in its own thread.
...
...
Alpha.Beta has finished
Try to restart the Alpha.Beta thread
ThreadStateException trying to restart Alpha.Beta. Expected since aborted threads cannot be restarted.

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