How to add dropdown YearID in current model section - html

Question

What I need
I need to add drop down and LabelFor YearID and add from model Year to
current model section with Formate bootstrap as (Replace departID WITH YearID).
I work in MVC 5 visual studio 2015 and i need to get drop down list from another model .
Current model name is Section:
namespace UniversityData.Models
{
[Table("Section")]
public partial class Section
{
public Section()
{
}
[Key]
public int SecID { get; set; }
[Required]
[StringLength(50)]
public string SecName{ get; set; }
[ForeignKey("Department")]
[DisplayName("DepartmentName")]
public int departID { get; set; }
}
}
My code to drop down departID inside my current model section with bootstrapis:
<div class="form-group">
#Html.LabelFor(model => model.departID, "DepartmentName", htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownList("departID", null, htmlAttributes: new { #class = "form-control" })
#Html.ValidationMessageFor(model => model.departID, "", new { #class = "text-danger" })
</div>
</div>
Another model Year I want to generate dropdown to it
[Table("Year")]
public partial class Year
{
public Year()
{
this.department = new HashSet<Department>();
}
[Key]
public int YearID { get; set; }
[Required]
[StringLength(50)]
public string YearName { get; set; }
}
}
what i try as following :
<div class="form-group">
// how to add labelfor replace of text
YearName:
<div class="col-md-10">
#Html.DropDownList("YearID", null, htmlAttributes: new { #class = "form-control" })
</div>
</div>
I get error :
{"DataBinding: 'System.Data.Entity.DynamicProxies.Department_3D49A8148DA2B6C2F8801CE72951BF7FDBF82503B3A52665397F8B7058E3F8A8' does not contain a property with the name 'YearName'."}

Answer 1

Thank you I solved my problem
The problem found in action :
ViewBag.YearID = new SelectList(db.years.ToList(), "YearID", "YearName");
before it found as db.departments.ToList() so that error come after i change departments to years problem solved because drop down for years not department .
And in view i do as following :
<div class="form-group">
#Html.Label("YearName", htmlAttributes: new { #class = "control-label col-md-2" })
<div class="col-md-10">
#Html.DropDownList("YearID", null, htmlAttributes: new { #class = "form-control" })
</div>
</div>