How to Bind Drodown data in MVC Cshtml page in c#

First u consider Employee and Department Tables

DepartmentContext :
--------------------
Employee 
Department



Employee 
------------------
Id
name
departmentId   Foreign key From Department table

Department:
--------------------
id
name

View Model:
EmployeeDepartment
------------------------
Id
name
EmployeeId
EmployeeNames


In Controller code:
---------------------------------
Public ActionResult GSVActoionMethod()
{
DepartmentContext db=new DepartmentContext ();

var employeeDepartments=db.Department.Select(a=> new EmployeeDepartment(){
Id = a.id,
name=a.name,
EmployeeNames=db.Employees.Where(m=>m.departmentId   == a.id).ToList()

})
return View(employeeDepartments);
}


In ViewPage :GSVActoionMethod.cshtml
------------------------------------------------------
@model MySample.Models.EmployeeDepartment

@{
ViewData.Name="GSV"
}
<H1>GSV</H1>

@using(Html.BeginForm())
{
@Html.AntiForeignKeyToken()

@Html.ValidationSummary()

<div>
@Html.Label("Select Employee",new {@class="from-contol"})

<div class="form-group">
@Html.DropDownListFor  (m=>m.EmployeeId,new SelectList(Model.EmployeeNames,"Id","Name"),new {@class="form-control"})
</div>
</div>

}