Calling synchronous method asynchronously in .Net 3.5

• We can call the methods asynchronously using custom  delegate that has an exact signature of method that you want to call asynchronously.

• To know the completion status of the asynchronous method AsyncCallback delegate can be used.

      Below example illustrates the Asynchronous method execution.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace AsyncDemo

{

    class Program

    {

        static void Main(string[] args)

        {

            AsyncDemo ad = new AsyncDemo();

            AsyncDelegate asyncDelegate = new AsyncDelegate(ad.AsyncDelegate);

            AsyncCallback callback = new AsyncCallback(ad.Status);

            IAsyncResult result = asyncDelegate.BeginInvoke(callback, null);

            Console.WriteLine("Async method execution is running and status of completion is {0}", result.IsCompleted);

            Console.ReadLine();

        }

    }

    public delegate void AsyncDelegate();

    public class AsyncDemo

    {

        /// <summary>

        /// Method that executes asynchronously

        /// </summary>

        public void AsyncDelegate()

        {

            int a = 0;

            for (int i = 0; i < 2000000000; i++)

            {

                a += i;

            }

            Console.WriteLine("total  {0}", a);

        }

        /// <summary>

        /// Callback method that is invoked after the completion of async method execution

        /// </summary>

        /// <param name="result"></param>

        public void Status(IAsyncResult result)

        {

            Console.WriteLine("Async method execution is completed");

        }

    }

}

For more information follow the link http://msdn.microsoft.com/en-us//library/2e08f6yc.aspx