public QuestionBase GetQuestionById(int questionId)
{
QuestionBase result = (from question in questions
where question.Id == questionId
select question).FirstOrDefault();
return(result);
}
public void RemoveQuestionById(int questionId)
{
QuestionBase question = GetQuestionById(questionId);
if (question != null)
{
int pos = questions.IndexOf(question);
this.questions.RemoveAt(pos);
}
}
public int AddQuestion(QuestionBase question)
{
this.questions.Add(question);
return(question.Id);
}