static void Main(string[] args)
{
int i,grade;
Student s1 = new Student(), s2 = new Student(), s3 = new Student();
Teacher t1 = new Teacher(), t2 = new Teacher();
Course ProgrammingWithCSharp = new Course("Programming with C#");
//set all students' name
s1.FirstName = "S1_F";
s2.FirstName = "S2_F";
s3.FirstName = "S3_F";
s1.LastName = "S1_L";
s2.LastName = "S2_L";
s3.LastName = "S3_L";
//set all students' grades
s1.EnterGrades();
s2.EnterGrades();
s3.EnterGrades();
//add all student to course class
ProgrammingWithCSharp.AddStudent(s1);
ProgrammingWithCSharp.AddStudent(s2);
ProgrammingWithCSharp.AddStudent(s3);
//add two teacher to course class
ProgrammingWithCSharp.AddTeacher(t1);
ProgrammingWithCSharp.AddTeacher(t2);
//add course to degree
Degree Bachelor = new Degree("Bachelor");
Bachelor.AddCourse(ProgrammingWithCSharp);
//add degree to uprogram
UProgram InformationTechnology = new UProgram("Information Technology");
InformationTechnology.AddDegree(Bachelor);
//list students' name
ProgrammingWithCSharp.ListStudents();
//list all students' grades
s1.ListGrades();
s2.ListGrades();
s3.ListGrades();
Console.ReadLine();
}