public void markStudentPresent(Student student)
{
// save student present
DateTime entryTime = DateTime.Now;
presentStudents.Add(student,entryTime);
}
static void Main(string[] args)
{
Student student = new Student(123);
Instructor instructor = new Instructor(100);
Course course = new Course(2070, "Data Structures and Algo", 3);
CourseSection section = new CourseSection(1005, course, instructor);
section.addStudent(student);
// Class period
ClassPeriod period = new ClassPeriod(1, section);
period.markStudentPresent(student);
period.printStatus();
Console.ReadLine();
}