//return filter questions
public List <string> loadquestions(String user, String lesson, List <string> categories, List <int> diff)
{
List <string> questions = new List <string>();
foreach (String category in categories)
{
foreach (int differ in diff)
{
try
{
questions.AddRange(db.qQuestions(user, lesson, category, differ));
}
catch
{
//δεν υπήρχαν αρκετες ερωτήσεις
}
}
}
return(questions); //return all questions with my filters
}
