Define an application to include classes for Student, GraduateStudent,
and UndergraduateStudent. Create .DLL files for the three classes.
Include characteristics in the Student class that are common to GraduateStudent
and UndergraduateStudent students. All three classes should
override the ToString( ) method. GraduateStudent should include
a data field for the type of undergraduate degree awarded, such as B.A.
or B.S., and the location of the institution that awarded the degree.
UndergraduateStudent should include classification (for example,
freshman, sophomore), and parent or guardian name and address. Create a
presentation class that instantiates student objects and enables details to be
displayed on the form about individual students to test your design.