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

1. Edit this Web Client from Creating and Accessing WCF Services simple sample.


Simplest Asynchronous WCF Service Call sample from ASP.NET


Key takeaway:


1. When add the Service Reference click the Advance button and choose Generate asynchronous operations.




2. Create a callback method.


public void GetCallback(object sender, ServiceReference1.GetDataCompletedEventArgs e)





3. Add code to button click event.


protected void Button1_Click1(object sender, EventArgs e)


  ServiceReference1.ServiceClient svc = new ServiceReference1.ServiceClient();

  svc.GetDataCompleted += new EventHandler<ServiceReference1.GetDataCompletedEventArgs>(GetCallback);

  //Asynchronous call to WCF




4. Add the directive below to aspx page.




The complete directive will look as below.


<%@ Page Language=”C#” Async=”true” AutoEventWireup=”true” CodeBehind=”Default.aspx.cs” Inherits=”WebAppWCPAsyncClient.Default” %>


Download the complete code from The sample file name is WCFServiceAsync.rar. My MSN ID is


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

  1. Pingback: Calling Synchronous Methods Asynchronously – simplify sample | Chanmingman's Blog

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