How to get dropdownlist selected value in mvc.

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C#

HTML

MVC4

Hi,
I am trying to get the selected value of dropdownlist in mvc,
In my view I have textbox and dropdwnlist I am getting textxboxes value in controller but not getting dropdownlist selected value.

Please help me to know what I am missing.

I have below code.

In Model

public class ValveCertificateModel
    {
        public string Leakage { get; set; }
        public int Job { get; set; }
    }

In ViewModel

public class ValveCertificateViewModel
    {
        public ValveCertificateModel ValveCertificateData { get; set; }
        public IEnumerable<TableSignalModel> SignalModel { get; set; }
    }

public class TableSignalModel
   {
       public string SignalName { get; set; }
   }

In Controller

public ActionResult Index()
       {
           var valveFields = CertificateRepository.GetValveFields();
           return View(valveFields);
       }

       [HttpPost]
       public ActionResult Display(ValveCertificateViewModel list)
       {
           //TODO
           return View(paraList);
       }

What I have tried:

In View

@using (Html.BeginForm("Display", "Certificate", FormMethod.Post))
{
@Html.LabelFor(m => m.ValveCertificateData.Job, new { @class = "labelColor" }) :
                                                @Html.TextBoxFor(m => m.ValveCertificateData.Job, new { @class = "form-control" })

@Html.DropDownListFor(m => m.ValveCertificateData.Leakage, new List(Model.SignalModel, "", "SignalName", Model.ValveCertificateData.Leakage),"Select one", new { @class = "form-control" });
}

When I run this I am getting list of SignalName in dropdwnlist, and on select the itemand on submit button click, In controller In list I am getting null for leakage property.
but I am getting textbox value in controller.