When creating a WCF Service Application for your Silverlight application you will encounter a "cross domain" error with default configurations.
Below I show the default Service application code (only class name changed) and made the necessary Silverlight WCF configuration change for basicHttpBinding as shown by the arrow.
I then created a Web Service reference for both my Silverlight application and Test application. Note that Silverlight uses Async calls while the Test project uses Sync call to obtain data.
When I run the Silverlight application I get the following error:
I added the following clientaccesspolicy.xml file per THIS LINK (you can copy code from it) to my WCF Service and both my Silverlight and Unit test run without issue.
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