Adding object

The problem is that I do not know nothing yet about List. I instantiate five Student object, then instantiate a Course object called Biology and finally I want to add my first student to this previous Course object(Biology). I didn't create any constructor in my Student class, I think I can't do Student[0] = new Student(pass Biology as one of my parameters). Here is my Student and my Course class file:

    public class Student
    {
        private string sfirstName;
        private string slastName;
        private DateTime sbirthdate;
        private static int studentEnrolled;
        private string courseAffected;
        public string sFirstName
        {
            get
            {
                return sfirstName;
            }
            set
            {
                sfirstName = value;
            }
        }

        public string sLastName
        {
            get
            {
                return slastName;
            }
            set
            {
                slastName = value;
            }
        }

        public DateTime sBirthdate
        {
            get
            {
                return sbirthdate;
            }
            set
            {
                sbirthdate = value;
            }
        }

        public static int StudentEnrolled
        {
            get
            {
                return studentEnrolled;
            }
            set
            {
                studentEnrolled = 0;
            }
        }

        public string CourseAffected
        {
            get
            {
                return CourseAffected;
            }
            set
            {
                CourseAffected;
            }
        }
}

public class Course
    {
        private string courseName;
        public string CourseName
        {
            get
            {
                return courseName;
            }
            set
            {
                courseName = value;
            }
        }
    }