Issue on retrieving value from DropDownListFor - asp.net-mvc

Question

I have a situation where I would like administrators to re-order questions to however they like, however, I have an issue on retrieving the value selected from the "DropDownListFor" from my form to my controller.
Placing the breakpoint at "Debug.WriteLine(MV.Count), the variable "SetNewValue" returns null in my controller
So what is the proper way to retrieve the new value that is selected and my default selected value from my DropDownListFor, as well as the current question number to my controller upon "onchange = this.form.submit()"?
I know the [HttpPost] Controller part is not a proper method to swap the questions, it is there for me to see whether the variables I have set do return the values that are sent from the DropDownListFor upon "onchange" form submit.
Any form of help is appreciated, as I am a beginner in MVC.
My View
#model IList<AppXamApplication.Models.EditQuestionsAndAnswersViewModel>
#{
ViewBag.Title = "EditQuestionsPage2";
}
<h4>Edit Your Questions Here</h4>
#using (Html.BeginForm("EditQuestionsPage2", "ExamAdmin", FormMethod.Post, new { #class = "form-horizontal", role = "form" }))
{
<table id="tblQuestions" border="0" style="border:none">
#for (int i = 0; i < Model.Count; i++)
{
if (Model[i].TypeOfQuestion == "Open Ended")
{
<tr>
<td>
#Html.DropDownListFor(m => m[i].SetNewValue, new SelectList(Model[i].TotalNoQuestions, "Value", "Text", Model[i].ToSetPreSelectValue), new { #Name = "CurrentQnAction", onchange = "this.form.submit();" })
#Html.HiddenFor(m => m[i].CurrentQuestionNumber, new { CurrentQnNoID = Model[i].CurrentQuestionNumber })
</td>
<td> </td>
<td> </td>
<td>
#Html.ActionLink("Delete Question", "EditQuestionsPage2", new { Question_ID = Model[i].QuestionID, #class = "form-control" })
</td>
</tr>
<tr>
<td>
<b>Question Type: #Html.DisplayFor(m => m[i].TypeOfQuestion, new { #class = "form-control" }) </b>
</td>
</tr>
<tr>
<td>
#Html.EditorFor(m => m[i].QuestionsAsked, new { #class = "form-control" })
</td>
</tr>
<tr>
<td>
<br />
<br />
</td>
</tr>
}
}
</table>
}
Edited: My Model
public class EditQuestionsAndAnswersViewModel
{
//Questions
public string QuestionID { get; set; }
public string TypeOfQuestion { get; set; }
public string ExamID { get; set; }
public string QuestionsAsked { get; set; }
public string UserID { get; set; }
public int? OrderingQuestions { get; set; }
public int? CurrentQuestionNumber { get; set; }
public string SetNewValue { get; set; }
public int? ToSetPreSelectValue{ get; set; }
public IList<SelectListItem> TotalNoQuestions { get; set; }
public IList<EditAnswers> PossibleAnswers { get; set; }
public string AnswerID { get; set; }
public string AnswerText { get; set; }
}
Edited: My Controllers
[HttpGet]
public ActionResult EditQuestionsPage2()
{
if (ModelState.IsValid)
{
using (var ctx = new AppXamApplicationEntities())
{
var CurrentExamID2 = (string)Session["CurrentExamID2"];
string CurrentExamID2_string = Convert.ToString(CurrentExamID2);
var query = ctx.Questions.Where(x => x.ExamID.Equals(CurrentExamID2_string))
.Select(x => new EditQuestionsAndAnswersViewModel()
{
QuestionID = x.QuestionID,
TypeOfQuestion = x.TypeOfQuestion,
ExamID = x.ExamID,
QuestionsAsked = x.QuestionsAsked,
UserID = x.UserID,
ToSetPreSelectValue= x.QuestionOrder,
// To Order the questions in ascending order
OrderingQuestions = x.QuestionOrder,
// To Display Current Question Number
CurrentQuestionNumber = x.QuestionOrder,
// To Display the dropdownlist as well as set the default selected value to be displayed for each question in the dropdownlist
TotalNoQuestions = ctx.Questions.Where (v=> v.ExamID.Equals(x.ExamID)).Select(v => new SelectListItem
{
Value = v.QuestionOrder.ToString(),
Text = v.QuestionOrder.ToString(),
}).ToList(),
PossibleAnswers = x.Answers.Where(y => y.QuestionID.Equals(x.QuestionID)).Select(y => new EditAnswers()
{
AnswerID = y.AnswerID,
AnswerText = y.AnswerText
}).ToList()
}).ToList().AsQueryable();
var queryOrdered = query.OrderBy(x=> x.CurrentQuestionNumber).ToList();
return View(queryOrdered);
}
}
return View();
}
[HttpPost]
public ActionResult EditQuestionsPage2(string action, string CurrentQnAction, int? CurrentQnNoID, IList<EditQuestionsAndAnswersCollectionModel> MV, string ToRetrieveSelectedValue, AddQuestions _model)
{
if (ModelState.IsValid)
{
if (CurrentQnNo!= null)
{
//Breakpoint placed over here
Debug.WriteLine(MV.Count);
}
}
return View();
}