public ActionResult FilterCourses(string courseName, string teacherName, int?lessonsCount)
{
Course[] aggregatedCourses = _coursesService.GetAggregatedCourses();
_coursesService.FilterCourses(ref aggregatedCourses, courseName, teacherName, lessonsCount);
var model = new BoardModel
{
AggregatedCourses = aggregatedCourses
};
return(PartialView("_PartialAggregatedCourses", model));
}