.net 4.0 - How to have n variables in C# -

imagine code

for (int iday = 1; iday <= total_days; iday++) {      question = checkstring(s.challenge_1_q);     answer = checkstringa(s.challenge_1_a);      // more here } 

but have challenge_1_q challenge_24_q , challenge_1_a challenge_24_a

what best option have dynamic variables today it's 24, "tomorrow" 18.

is use of dynamic proper way? or need have switch , forget dynamism ?

create class called questionanswer, store list on s. accessing code this:

question = checkstring(s.questionanswers[i].question); answer = checkstringa(s.questionanswers[i].answer); 

the questionanswer class:

public class questionanswer {   public string question{get; set;}   public string answer{get; set;} } 

and definition on existing class:

public list<questionanswer> questionanswers = new list<questionanswer>(); 

instead of having dozens of variables, add dozens of items list:

questionanswer qa = new questionanswer(); qa.question = "what letter comes after a?"; qa.answer = "b"; questionanswers.add(qa); //repeat questions.