I have Downloaded demo project from here
I tried to run Silverlight project SkiResult.ThinClient from the “Solution Explorer” I have configured the database nicely as SkiResult.FullClient a WPF Project works fine and display data.
But whenever I have tried to run Silverlight project in my Solution Explorer it shows me following error message.

I have googled so much I have also found one solution that set xyz.WEB project as a Start Up Project but as u can see from below screenshot of my Solution Explorer there is no xyz.WEB project in solution.

Thank you so much…..
Try setting the
SkiResult.DataServiceproject to be the startup project. This looks very much a web project created to host a Silverlight application because:Silverlight.jsfile (some utility JavaScript used with Silverlight),When you create a Silverlight project, Visual Studio offers to create a web application project to host the Silverlight application for you. (You don’t have to create a web application – VS can generate a test webpage during the build process and use that instead.) If your Silverlight project is called
Xyz, then this web application will be calledXyz.Web. However, with the solution you’re dealing with above, it seems this project has been renamed from the default.