How to add dropdown YearID in current model section

Question

What I need

I need to add drop down YearID 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()
        {

        }


        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]

        [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 bootstrap is : 

class="form-group">
          @Html.LabelFor(model => model.departID, "DepartmentName", htmlAttributes: new { @class = "control-label col-md-2" })
          class="col-md-10">
              @Html.DropDownList("departID", null, htmlAttributes: new { @class = "form-control" })
              @Html.ValidationMessageFor(model => model.departID, "", new { @class = "text-danger" })

Another model Year I want to generate dropdown to it 

 [Table("Year")]
    public partial class Year
    {
        public Year()
        {
         this.department = new HashSet();

        }
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]

        [Key]
        public int YearID { get; set; }
        [Required]
        [StringLength(50)]

        public string YearName { get; set; }

    }
}

What I need

 

I need to add drop down YearID from model Year to

current model section with Formate bootstrap as (departID BOOTSTRP dropdown)