Filter XML from XELement in Silverlight

XElement rss = XElement.Load(sr); s =
new XElement("NewDataSet",
from table in rss.Elements("Table")
select new XElement("Table", table.Elements()
)
);
filterCategory =

new XElement("NewDataSet",
from table in rss.Elements("Table")
where (string)table.Element("PDF_NAME") == "Shiley_Quick_Reference_Guide.pdf"
select new XElement("Table", table.Elements()
)
);