Unable to retrieve dynamic control generated from db - POST values (Model Binding)

Question

I have been developing an ASP.NET MVC page where I need to bring the controls from database, so in database I have created our control details like name, value, id.

The one way GET path is done, now in POST I find amazing that I am not able to get the IEnumerable<MyControls> with the help of model binder, hope it would be nice learning for me If someone tell me whats wrong or some thing architecturally I am missing out pls help me with my piece of this work.

Model

public class QuestionaireControlMasterModel
{
    public int Id { get; set; }

    public int Questiono { get; set; }
    public string Question { get; set; }
    public string ControlType { get; set; }
    public string ControlDescription { get; set; }
    public string ControlName { get; set; }

    // My question from Question table   //
    public string ControlLabel { get; set; }
    public string ControlId { get; set; }
    public string ControlValue { get; set; }
    public string IsChecked { get; set; }

    // for ddl list//
    public List<string> ddlhtmllistppt { get; set; }
}

ViewModel

public class ControlViewModel
{
    public IEnumerable<QuestionaireControlMasterModel> ListofControls { get; set; }
}

Database:

create table ControlMaster
(
    ControlType int identity primary key,
    ControlDescription nvarchar(500)
)

create table Questionaire
(
    Questiono int identity(1,1) primary key,
    Question nvarchar(500),
)

create table QuestionaireControlMaster
(
    Id int identity (1,1) primary key,
    Questiono int
        Constraint fk_QuestionaireControlMaster_Questiono 
             references Questionaire(Questiono),
    ControlType int 
        Constraint fk_QuestionaireControlMaster_ControlType 
             references ControlMaster(ControlType),

    // Control Name I use in View //
    ControlName1 nvarchar(500),

    // Control Id I use in View //
    ControlId1 nvarchar(500),

    IsChecked1 nvarchar(500),
)

create table ValueMaster
(
    ValueID int identity(1,1) primary key,
    ControlValue nvarchar(500),
    Id int
        Constraint fk_ValueMaster_Id 
            references QuestionaireControlMaster(Id),
)

Controller

     public ActionResult Index()
            {

                // View Model Object//
                ControlViewModel controlviewmodel = new ControlViewModel();

                using (var db = new OfficialEntities())
                {
                    // Retrieval of data from QuestionMaster table

                    var retrievedlistfromdb = db.QuestionaireControlMasters.ToList();

                    //Creating a list of Questionaire table Model to store the list of controls needed//

                    List<QuestionaireControlMasterModel> listofquestionmodel = new List<QuestionaireControlMasterModel>();

                    // Storing the retrieved list of controls from db to our list in ViewModel //

// Mapping retrieved list from db to my list of controls //

                    foreach (var temp in retrievedlistfromdb)
                    {

                        QuestionaireControlMasterModel questionaireControlMasterModel = new QuestionaireControlMasterModel();
                        List<string> testinglist = new List<string>();
                        questionaireControlMasterModel.ControlType = temp.ControlMaster.ControlDescription;

                        if (questionaireControlMasterModel.ControlType == "checkbox")
                        {
                            questionaireControlMasterModel.ControlLabel = temp.Questionaire.Question;
                            questionaireControlMasterModel.ControlId = temp.ControlId1;
                            questionaireControlMasterModel.ControlName = temp.ControlName1;


                            using (var dbconnectovalues = new OfficialEntities())
                            {
                                var values = dbconnectovalues.ValueMasters.Where(x => x.Id == temp.Id).ToList();

                                if (values.Count == 1)
                                {
                                    foreach (var item in values)
                                    {

                                        questionaireControlMasterModel.ControlValue = item.ControlValue;
                                    }
                                }

                            }
                            questionaireControlMasterModel.IsChecked = temp.IsChecked1;

                            questionaireControlMasterModel.ddlhtmllistppt = testinglist;
                            listofquestionmodel.Add(questionaireControlMasterModel);
                        }
    // For Dropdownlist and textbox separate mapping //

                        else
                        {
                            questionaireControlMasterModel.ControlLabel = temp.Questionaire.Question;
                            questionaireControlMasterModel.ControlId = temp.ControlId1;
                            questionaireControlMasterModel.ControlName = temp.ControlName1;

                            using (var dbconnectovalues = new OfficialEntities())
                            {
                                var values = dbconnectovalues.ValueMasters.Where(x => x.Id == temp.Id).ToList();

                                if (values.Count == 1)
                                {
                                    foreach (var item in values)
                                    {

                                        questionaireControlMasterModel.ControlValue = item.ControlValue;
                                    }
                                }

                                if (values.Count > 1)
                                {

                                    foreach (var item in values)
                                    {

                                        string tempvar = item.ControlValue;

                                        testinglist.Add(tempvar);

                                    }
                                }
                            }
                            questionaireControlMasterModel.IsChecked = temp.IsChecked1;
                            questionaireControlMasterModel.ddlhtmllistppt = testinglist;
                            listofquestionmodel.Add(questionaireControlMasterModel);
                        }


                        // Attaching my List to the lIst property of the View Model//

                        controlviewmodel.ListofControls = listofquestionmodel;

                    }

                    //Passing ViewModel Object which contains the list of controls of Questionaire//
                    return View(controlviewmodel);
                }
            }

// Here is where the Model binder I am not able to understand why I am not able to get the list of QuestionaireMaster model which is a part of the ControlViewModel //

// Pls suggest If  something is architecturally wrong or need to do a work around//

    [HttpPost]
            public ActionResult Index(ControlViewModel sampleobject)
            {    

    // sample object is null, even I tried to get List<QuestionaireMasterModel> it was also null   //

    return View();
            }

PartialView

// Bound to List of Controls //

    @model IEnumerable<CDCPortal.Models.QuestionaireControlMasterModel>

    <table>

        @foreach (CDCPortal.Models.QuestionaireControlMasterModel DynamicModel in Model)
        {
            switch (DynamicModel.ControlType.ToLower())
            {
                case "textbox":
                    <tr>
                        <td>
                            @DynamicModel.ControlLabel
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <input type="text" name="@DynamicModel.ControlName" id="@DynamicModel.ControlId" value="@DynamicModel.ControlValue" />
                        </td>
                    </tr>
                    break;
               }
          }

View

// View bound to Viewmodel //

    @model CDCPortal.Models.ControlViewModel

    @using (Html.BeginForm())
    {
        <div>
// Using the Partial View here to render up controls//

            @Html.Partial("_ControlPartial", Model.ListofControls)
        </div>
        <div>
            <input type="submit" name="SubmitButton" value="Submit" />
        </div>

    }