MVC ListBoxFor Control

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MVC

Hi,
My View
@Html.ListBoxFor(model => model.PositionId, new MultiSelectList(Model.GetPostions, "PositionId", "PositionName",Model.PositionId))
@Html.ValidationMessageFor(model => model.PositionId)

My Controller

[HttpPost]
public ActionResult AddEmployee(EmployeeViewModel employeeViewModel)
{
//_employeeService.Insert(employeeViewModel);

return RedirectToAction("View", "Employee");
}

Now when I see PositionId in employeeViewModel,its Null..Please can I know anything wrong I made.