public static bool UnregisterCourse(int studentID, string course)
{
bool result = false;
try
{
if (RepositoryStudent.DoesStudentExists(studentID))
{
if (RepositoryStudent.WasStudentRegisteredForCourse(studentID, course))
{
if (!RepositoryStudent.HasStudentAlreadyCompletedCourse(studentID, course))
{
result = RepositoryStudent.UnRegisterCourse(studentID, course);
}
else
{
throw new Exception("Student is already graded for this course.");
}
}
else
{
throw new Exception("Student was not enrolled for this course.");
}
}
else
{
throw new Exception("Student is not registered.......");
}
}
catch (Exception)
{
throw;
}
return(result);
}
public static bool RegisterCourse(int StudentID, string semester, string course)
{
bool result = false;
try
{
if (RepositoryStudent.DoesStudentExists(StudentID))
{
if (RepositoryStudent.HasStudentTakenPreRequisites(StudentID, course, 2.0f))
{
if (RepositoryCourse.IsVacancyThereInCourse(course, semester))
{
result = RepositoryStudent.RegisterCourse(StudentID, semester, course);
}
else
{
throw new Exception("Course capacity exceeded..");
}
}
else
{
throw new Exception("Missing Prerequisite for " + course);
}
}
else
{
throw new Exception("Student with ID: " + StudentID + " not registered");
}
}
catch (Exception)
{
throw;
}
return(result);
}