How do I add a reference to another existing entity using code-first framework without first pulling the existing entity from the database -

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I am trying to add an existing product to the auction, but unable to do this without dragging the product before Database

This code works, but how do I go about providing the productive and then saving the auction 

  var product = new product () {// Known Existing Product ID ProductId = 1}; Var Auction = New Auction {BuyItNowPrice = 10. Product = Product, ... ...}; (Var db = New DataContext ()) using {var product = db.Products.Find (Auction.product.product ID); auction. Product = product; Db.Auctions.Add (Auction); Db.SaveChanges (); }    
 
 
 include scalar property  ProductId  in the  // other proerties}   
 then  
  auction. Producer = 1; db.Auctions.Add (auction); db.SaveChanges ();

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