Task Cancellation C# with Example

 using System;
using System.Threading;
using System.Threading.Tasks;

namespace CSharpMultiThreading
{
	class DemoCancelTask 
	{
		// A method to be run as a task.
		static void MyTask(Object ct) 
		{
			CancellationToken cancelTok = (CancellationToken) ct;
			
			// Check if cancelled prior to starting.
			cancelTok.ThrowIfCancellationRequested();
			Console.WriteLine("MyTask() starting");
			for(int count = 0; count < 10; count++) 
			{
				// This example uses polling to watch for cancellation.
				if(cancelTok.IsCancellationRequested) 
				{
					Console.WriteLine("Cancellation request received.");
					cancelTok.ThrowIfCancellationRequested();
				}
				Thread.Sleep(500);
				Console.WriteLine("In MyTask(), count is " + count );
			}
			Console.WriteLine("MyTask terminating");
		}

		static void Main() 
		{
			Console.WriteLine("Main thread starting.");

			// Create a cancellation token source.
			CancellationTokenSource cancelTokSrc = new CancellationTokenSource();

			// Start a task, passing the cancellation token to both the delegate and the task.
			Task tsk = Task.Factory.StartNew(MyTask, cancelTokSrc.Token, cancelTokSrc.Token);
			
			// Let tsk run until cancelled.
			Thread.Sleep(2000);
			try 
			{
				// Cancel the task.
				cancelTokSrc.Cancel();
				
				// Suspend Main() until tsk terminates.
				tsk.Wait();
			} 
			catch (AggregateException exc) 
			{
				if(tsk.IsCanceled)
				Console.WriteLine("\ntsk Cancelled\n");
				// To see the exception, un-comment this line: 
				// Console.WriteLine(exc);
			} 
			finally 
			{
				tsk.Dispose();
				cancelTokSrc.Dispose();
			}
			Console.WriteLine("Main thread ending.");
		}
	}
}