public void Subscribe(int userId, int coursId, DateTime startDate)
{
var user = context.Users.FirstOrDefault(x => x.Id == userId);
var course = context.Course.FirstOrDefault(x => x.Id == coursId);
var subcription = new UsersCourses {
User = user, Course = course, StartDate = startDate
};
context.UsersCourses.Update(subcription);
context.SaveChanges();
notificationEmailSender.ScheduleJobs(user.Email, course.Name, subcription.StartDate);
}
