How to send List of objects which is in User defined class

Question

My main Class 

public class QuestionAnswer

{

public string Question { get; set; }

public string Answer { get; set; }

public int Serial { get; set; }

public int SubmissionSerial { get; set; }

public List NoteTypeQuestions { get; set; }

}

In the main class, I am initializing List of another user-defined class(NoteTypeQuestion).

secondary class

public class NoteTypeQuestion

{

public string Note { get; set; }

public string NoteQuestion { get; set; }

public string NoteAnswer { get; set; }

}

In Controller, I am getting some data using api call and in that data if question contains "/" I want to send list of note type question with normal questions else I want to send only normal question answers to the View. 

Controller Method 

if (Question.Contains("/"))

{

string[] Notes = Question.Split('/');

string note = Notes[0].ToString();

string noteQuestion = Notes[1];

string noteAnswer = Convert.ToString(parsedProperty.Value);

aQuestionAnswer.NoteTypeQuestions.Add(new NoteTypeQuestion() { Note = note, NoteQuestion = noteQuestion, NoteAnswer = noteAnswer });

QuestionAnswerList.Add(aQuestionAnswer);

}

string Answer = Convert.ToString(parsedProperty.Value);


aQuestionAnswer.Question = Question;

aQuestionAnswer.Answer = Answer;

aQuestionAnswer.Serial = i;

QuestionAnswerList.Add(aQuestionAnswer);

return to the view 
return View(QuestionAnswerList);

In view 

@using EnracWebApp.Models

@model IEnumerable

I want to show List of QuestionAnswer data using foreach loop.

@foreach (var QuestionAnswers in Model)

{

@QuestionAnswers.Serial

@QuestionAnswers.Question

@QuestionAnswers.Answer

@foreach (var questionans in QuestionAnswers.NoteTypeQuestions)

{

@questionans.Note

@questionans.NoteQuestion

@questionans.NoteAnswer

}

}

The main problem is :
aQuestionAnswer.NoteTypeQuestions.Add(new NoteTypeQuestion() { Note = note, NoteQuestion = noteQuestion, NoteAnswer = noteAnswer });
How can I bind the data to the List ?