Error Message:

"System.ServiceModel.DomainServices.Client.DomainOperationException: Load operation failed fore query 'GetProducts'.... Failed to generate a user instance of SQL Server due to failure in retrieving the user's local application data path. Please make sure the user has a local user profile on the computer. The connection will be closed"

You can see this picture below that we have finished configure our Silverlight app using VS 2010 and .NET 4 framework.


Now, go to deploy the application.

Then open your inetmgr. The IIS Manager Window will show up. GO to MIME types.

In the appearing list, we’ll need to include the following types (XAML, XAP, XBAP) as shown in the image below


Now, in the left menu, let’s go to Sites, and let’s add our Web Site (as default site, virtual directory… based on our own needs). When done, let’s click in our application, like this:


If ASP.NET v4.0 is not selected, and you leave
DefaultAppPool
as I did in the beginning, you will get the following error message every time your application tries to connect with the database: “There is an error in the service with the Get function..”

So, now that we selected our Application Group, let us configure it. In the left panel (back in the IIS Manager Window), right above our Default Site, we’ll see “Application Groups”. Click it. A list will appear in the center panel. Let’s open the ASP.NET v4.0 and select the right framework version. Click ok and select it again, but instead of opening it, this time we’ll go to the right panel, and we’ll click on “Advance Configuration”:


Change the Local System and select Network Service, as shown in the image above. And that’s it! Now we are able to access our data from our Silverlight 4 application without getting any error from the Web Server.

Hope it helps!!

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