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

1. Create a WCF Service as in Creating and Accessing WCF Services simple sample.


2. Create Silverlight application.


3. Drag a textbox and Button from toolbox.


4. Add service reference.


5. Add the callback and button code.


Steps 2-5 show in the video below.


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


Key takeaway:


1. Generate asynchronous operations cannot be disable because Silverlight can only call WCF asynchronously.


2. Create a callback method.


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


  textBox1.Text = e.Result;



3. Add code to button click event.


private void button1_Click(object sender, RoutedEventArgs e)


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


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




4. You might need clientaccesspolicy.xml and crossdomain.xml files.


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



An error occurred while trying to make a request to URI ‘http://localhost/WCFService/Service.svc’. This could be due to attempting to access a service in a cross-domain way without a proper cross-domain policy in place, or a policy that is unsuitable for SOAP services. You may need to contact the owner of the service to publish a cross-domain policy file and to ensure it allows SOAP-related HTTP headers to be sent.

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

  1. Pingback: Delete a row / record from MS SQL Asynchronously using Silverlight with WCF Data Service | Chanmingman's Blog

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