public Subject(SubjectInformation subjectInfo)
{
Contract.Requires(subjectInfo != null, "subjectInfo");
SubjectInfo = subjectInfo;
}
public Subject(Dictionary <Student, SubjectSituation> signedUpStudentsGrades, SubjectInformation subjectInfo)
{
_signedUpStudentsGrades = signedUpStudentsGrades;
SubjectInfo = subjectInfo;
}