public static int findCrn(string courseName, string semester)
{
CourseDAL courseDal = new CourseDAL();
var crn = -1;
var courses = courseDal.GetCoursesByTeacherAndSemester(TeacherID, semester);
foreach (var course in courses)
{
if (course.Name.Equals(courseName))
{
crn = course.CRN;
}
}
return(crn);
}