public BookInfo GetBookInfo(string isbn)
{
// Throw exception if isbn is not present
if (isbn == null)
{
throw new Exception("Isbn not supplied");
}
// Get path to the data source
string path = string.Format("{0}books.xml",
HostingEnvironment.ApplicationPhysicalPath);
// TODO: Tell the browser NOT to cache this object
//WebOperationContext.Current.OutgoingResponse.Headers["cache-control"] = "no-store";
// Return book
return(BookInfo.GetBook(isbn, path));
}