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Multithreading And Threadpool Basic Example

1. Create a separate thread
2. Do some process using the thread.
3. Destroy the thread.
This approach will give unnecessarily overhead for the application. To avoid that .net introduces the concept of thread pool.

In the thread pool technique and instead of creating a new thread whenever you need one, your application will obtain a thread from the thread pool. After that obtained thread completes its task, it will be returned to the thread pool instead of destroying it - waiting for the next acquiring.

Let us implement threadpool.

Create a windows application.

Create a function that will take long time to execute

Here I am creating a function, which will create 1000 XML files and I am naming the function as CreateFiles()



public void CreateFiles(object o) {
  for (int i = 1; i < 1000; i++) {
    // Create an XMLDocument instance        
    XmlDocument doc = new System.Xml.XmlDocument();
    // Load the Xml String into XmlDocument        
    doc.LoadXml("<Root></Root>");
    // Save the document        
    doc.Save("C:\\karan\\" + i.ToString() + ".xml");
  }
  MessageBox.Show("done");
}




4. Now on an event say button click call the function.

bool status = ThreadPool.QueueUserWorkItem(new WaitCallback(CreateFiles));
MessageBox.Show("karan");

What Is The Difference Between Process And Thread?

1. A process contains multiple threads
2. A processor executes threads not processes
3. Different processes can't work under the same memory location. But the threads can work under the same memory area
4. A process can be executed as a single entity whereas thread cannot be executed as a single entity