public static void AddNotificationsGroup(List <MyZoneNotification> notifications, IEnumerable <Group> groups, string content)
 {
     foreach (var group in groups)
     {
         var notification = new MyZoneNotification()
         {
             Type    = MyZoneNotificationType.Group,
             Content = string.Format(content, group.Name, group.StartDate.Day, group.StartDate.Month)
         };
         notifications.Add(notification);
     }
 }
        public static void AddNotificationsBirthday(List <MyZoneNotification> notifications, IEnumerable <Student> students, string content)
        {
            foreach (var student in students)
            {
                var newAge       = DateTime.Now.Year - student.BirthDate.Year;
                var notification = new MyZoneNotification()
                {
                    Type    = MyZoneNotificationType.Birthday,
                    Content = string.Format(content, student.FullName, student.Group.Name, newAge, student.BirthDate.Day, student.BirthDate.Month)
                };

                notifications.Add(notification);
            }
        }