private static string ConcatenateStudentExams(List <Grade> StudentsExams)
{
string result = "";
foreach (var item in StudentsExams)
{
// out of time use stringbuilder
var courseNames = new DataAccessor().GetCourses();
var courseName = courseNames.FirstOrDefault(x => x.CourseId == item.CourseId).CourseName.ToString();
result += courseName + "||";
}
return(result);
}