public static void AddWorker() { var workers = new List <Worker> { new Worker { Id = 1, Age = 10, Name = "ssss" }, new Worker { Id = 4, Age = 10, Name = "qwe" }, new Worker { Id = 5, Age = 10, Name = "Krzyszqwetof" }, new Worker { Id = 6, Age = 10, Name = "qwe" }, new Worker { Id = 2, Age = 15, Name = "Tom" }, new Worker { Id = 3, Age = 12, Name = "Andrzej" }, }; using (var context = new employeesCrudAppContext()) { context.Workers.AddRange(workers); context.SaveChanges(); } }