public bool CheckIfCanSignUpForCourseBasedOnTimes(int crn, string studentID, string semesterID)
        {
            //get all courses that a student is currently signed up for
            //check if those courses time's directly conflict with the new course's time
            bool          canSignUp      = true;
            CourseDAL     courseGetter   = new CourseDAL();
            List <Course> currentCourses = courseGetter.GetCoursesByStudentIDAndSemester(studentID, semesterID);
            CourseTimeDAL timeChecker    = new CourseTimeDAL();
            CourseTime    desiredTime    = timeChecker.GetCourseTimeByCRN(crn);

            foreach (var currentCourse in currentCourses)
            {
                CourseTime currentTime = timeChecker.GetCourseTimeByCRN(currentCourse.CRN);
                foreach (var currentDay in currentTime.CourseDays.ToCharArray())
                {
                    foreach (var desiredDays in desiredTime.CourseDays.ToCharArray())
                    {
                        if (desiredDays == currentDay)
                        {
                            if (desiredTime.CourseStart.TimeOfDay > currentTime.CourseStart.TimeOfDay &&
                                desiredTime.CourseStart.TimeOfDay < currentTime.CourseEnd.TimeOfDay)
                            {
                                canSignUp = false;
                                return(canSignUp);
                            }
                        }
                    }
                }
            }

            return(canSignUp);
        }