LINQ query performance.

The page pulls data from a ProductDocuments table.  And it does a lookup to a Documents table from there, based on a specific document type ID.
 
If this was direct SQL, it would look like this: “SELECT TOP 1 DocumentFile FROM Document inner join ProductDocuments pd on pd.DocumentID = d.DocumentID INNER JOIN DocumentContent dc on dc.DocumentID = d.DocumentID WHERE dc.DocumentTypeID = 1 AND pd.ProductID = 1 and DocumentID is not null”
 
But in LINQ it looks like this…. 
 
      return (from pd in ProjectDocuments
                        join d in db.Documents on pd.DocumentID equals d.DocumentID
                        join dc in db.DocumentC ...