public Question GetRandomQuestion()
        {
            Random random       = new Random();
            int    randomNumber = 0;

            if (AvailableQuestionsByNumber.Count > 1)
            {
                List <int> listOfAvailableKeys = new List <int>();
                foreach (var item in AvailableQuestionsByNumber)
                {
                    listOfAvailableKeys.Add(item.Key);
                }
                int[] arrayOfAvailableKeys = listOfAvailableKeys.ToArray();
                do
                {
                    randomNumber = arrayOfAvailableKeys[random.Next(1, arrayOfAvailableKeys.Length)];
                } while (AvailableQuestionsByNumber.Any(x => x.Key == randomNumber) == false);
            }
            else
            {
                randomNumber = AvailableQuestionsByNumber.Single().Key;
            }

            var question = AvailableQuestionsByNumber.Where(x => x.Key == randomNumber).Single();

            return(question.Value);
        }
        public void RemoveQuestionFromAvailableList(Question question)
        {
            var dictionaryQuestion = AvailableQuestionsByNumber.Where(x => x.Value == question).Single();

            AvailableQuestionsByNumber.Remove(dictionaryQuestion.Key);
        }