private void EnterCourse2()
        {
            string name = "thermo" + DateTime.Now.ToString();

            using (var db = new CourseraContext())
            {
                Course course = new Course();
                course.Name = name;
                db.Courses.Add(course);
                db.SaveChanges();
            }
        }
        private static void EnterCourse()
        {
            string name = "";

            while (name != "0")
            {
                Console.WriteLine("Enter name of course (0 to exit):");
                name = Console.ReadLine().Trim();
                if (name != "0")
                {
                    using (var db = new CourseraContext())
                    {
                        Course course = new Course();
                        course.Name = name;
                        db.Courses.Add(course);
                        db.SaveChanges();
                    }
                }
            }
        }