public static void Main() { Student student1 = new Student(); student1.StudentId = 1; student1.Name = "A"; student1.Marks = 100; Student student2 = new Student(); student2.StudentId = 2; student2.Name = "AB"; student2.Marks = 10; StudentContext studentContext = new StudentContext(); studentContext.AddStudent(student1); studentContext.AddStudent(student2); studentContext.AddFriend(student1, student2); student1.Marks = 50; student2.Marks = 77; }