private static void SeedUsers(ProductShopContext context)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load("../../../users.xml");

            string query = "/users/user";
            XmlNodeList users = doc.SelectNodes(query);

            foreach (XmlNode user in users)
            {
                User newUser = new User();
                var attributes = user.Attributes;
                foreach (XmlAttribute attribute in attributes)
                {
                    if (attribute.Name.Equals("first-name"))
                    {
                        newUser.FirstName = attribute.InnerText;
                    }
                    else if (attribute.Name.Equals("last-name"))
                    {
                        newUser.LastName = attribute.InnerText;
                    }
                    else if (attribute.Name.Equals("age"))
                    {
                        newUser.Age = int.Parse(attribute.InnerText);
                    }
                }

                context.Users.AddOrUpdate(newUser);
            }

            context.SaveChanges();
        }