public IActionResult CustomFeedback(FeedbackItemModel entity, int courseId, int count)
{
var currentUserId = userBLL.GetByEmail(CurrentUser.email).id;
var studentsinCourse = courseBLL.AllStudentOfACourse(courseId);
List <int> choosen = new List <int>();
for (int i = 0; i < count; i++)
{
var canPick = studentsinCourse.Except(choosen).Except((new int[] { currentUserId }).ToList()).ToList();
int index = Database.random.Next(canPick.Count());
choosen.Add(canPick[index]);
}
foreach (var item in choosen)
{
feedbackBLL.Add(new FeedbackModel()
{
courseId = courseId, fromUserId = item, toUserId = currentUserId
}, false);
}
return(Redirect("/course/list"));
}