Its urgent help:HOW TO Open the .pdf file present in the root path ofthe application?

Hi Friends,

I am new to Silver light.

I have written the below code which will open the .pdf file from the silverligt path.
as below:

Uri uri = new Uri(HtmlPage.Document.DocumentUri, "/ClientBin/10c.pdf");
string path = uri.AbsoluteUri.ToString();
HtmlPage.Window.Eval("'" + path + "')");
//HtmlPage.Window.Eval("document.location.href='" + path + "';");

I want to open the .pdf file kept in the root directory of the application, (note - do not hard code)
ex: i want to open the .pdf file kept in the below location:

Its very urgent, help me out.