public IActionResult Get(int studentId, int courseId)
{
var student = studentRepository.GetById(studentId);
if (student == null)
{
return(NotFound("Student does not exist."));
}
var course = courseRepository.GetById(courseId);
if (course == null)
{
return(NotFound("Course does not exist."));
}
var mark = marksRepository.GetMarksModel(studentId, courseId);
if (mark == null)
{
return(NotFound("Mark does not exist."));
}
return(Ok(mark));
}