public JsonResult GetTeacherInfo(int teacherId)
{
List <CourseAssign> coursesIdList = CourseAssignManager.GetCoursesByTeacherId(teacherId);
decimal credit = 0;
foreach (CourseAssign course in coursesIdList)
{
credit += CourseManager.GetCourseById(course.CourseId).Credit;
}
decimal takenCredit = TeacherManager.GetTeacherById(teacherId).Credit;
decimal remainingCredit = takenCredit - credit;
var teacher = new Teacher();
teacher.Credit = takenCredit;
teacher.RemainingCredit = remainingCredit;
return(Json(teacher));
}