Calling Synchronous Methods Asynchronously – simplify sample

Today we have new async call method in async framework. Let take a look on how we have done it in the past.


1. Create a Console project.

2. Create a class file and paste the following code.


using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;


namespace ConAppAsyncDemo




        // The method to be executed asynchronously.

        publicstring TestMethod(int callDuration, outint threadId)


            Console.WriteLine(“Test method begins.”);


            threadId = Thread.CurrentThread.ManagedThreadId;

            returnString.Format(“My call time was {0}.”, callDuration.ToString());



    // The delegate must have the same signature as the method

    // it will call asynchronously.

    publicdelegatestringAsyncMethodCaller(int callDuration, outint threadId);



3. Paste the follow code in the main function.


// The asynchronous method puts the thread id here.

int threadId;


// Create an instance of the test class.

AsyncDemo ad = newAsyncDemo();


// Create the delegate.

AsyncMethodCaller caller = newAsyncMethodCaller(ad.TestMethod);


// Initiate the asychronous call.

IAsyncResult result = caller.BeginInvoke(3000,

    out threadId, null, null);



Console.WriteLine(“Main thread {0} does some work.”,



// Call EndInvoke to wait for the asynchronous call to complete,

// and to retrieve the results.

string returnValue = caller.EndInvoke(out threadId, result);


Console.WriteLine(“The call executed on thread {0}, with return value \”{1}\”.”,

          threadId, returnValue);



Simplest Asynchronous WCF Service Call sample from ASP.NET – C# (Video)

Simplest Asynchronous WCF Service Call sample from Silverlight – C# (Video)

About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress ( till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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One Response to Calling Synchronous Methods Asynchronously – simplify sample

  1. Pingback: Use WCF Test Client to test WCF Service Application | Chanmingman's Blog

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