Retrieve from multiple tables and update with LINQ

public void updateShoes(Shoe shoe) 

{ 

var query = from b in db.BrandTbls.AsQueryable() 

            join m in db.ShoeModelTbls on b.BrandID equals m.BrandID 

            join s in db.ShoeTbls on m.ModelID equals s.ModelID 

where shoe.ShoeID == s.ShoeID orderby m.ModelName 

select new { Shoe = shoe, Brand = b, Model = m  

           }; 

foreach(var o in query) {  

       o.Shoe.ColorName = "Black";   

      o.Brand.BrandName = "New Branding";   

      o.Model.ModelName = "Something else";

 }

      db.SaveChanges(); 

}