How do I add an exisitng file to a silverlight client application at runtime

See more:

Silverlight

What I want is to display a pdf file in a pdf viewer from the silverlight client side. I have the pdf file on a local drive which I should display. Any help will be appreciated. Am using Silverlight 5, .Net framework 4.0.30319

What I have tried:

I have tried to use the following piece of code:

var wc = new WebClient();
wc.OpenReadCompleted += (s, e) => c1PdfViewer1.LoadDocument(e.Result);
wc.OpenReadAsync(new Uri(ILMIS;component/Files/SelectedFile.pdf", UriKind.Relative));
The above code works ok, But I want to point the uri to the actual file:
wc.OpenReadAsync(new Uri(@"C:\PDF\SelectedFile.pdf", UriKind.Relative));