public bool editProduct(Product product)
        {
            ProductContext db = new ProductContext();
            if(product != null)
            {
                db.Entry(product).State = EntityState.Modified;
                //db.SaveChanges();
                bool saveFailed;
                do
                {
                    saveFailed = false;

                    try
                    {
                       db.SaveChanges();
                    }
                    catch (DbUpdateConcurrencyException ex)
                    {
                        saveFailed = true;

                        // Update the values of the entity that failed to save from the store
                        ex.Entries.Single().Reload();
                    }

                } while (saveFailed);
                return true;
            }
            else
            {
                return false;
            }
        }
 public bool editCategory(Category cat)
 {
     var db = new ProductContext();
     if(cat != null)
     {
         db.Entry(cat).State = EntityState.Modified;
         db.SaveChanges();
         return true;
     }
     return false;
 }