namespace SBDR.Models
{
    [Table("Select_Ref_VehicleBrands")]
    public class Select_Ref_VehicleBrands  {
        [Key]
        public int ID { get; set; }
        [Required (AllowEmptyStrings = false, ErrorMessage = "жопа приключилась")]
        public String Title { get; set; }
    }
}

<div class="modal fade RefBrandsForm">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        
        <button data-dismiss="modal" class="close"><span>&times;</span></button>
        <div class="modal-title"><h2>+</h2></div>
      </div>
      <div class="modal-body">
        @{
          if (id == 1)
          {
            @Html.Partial("~/Views/Reference/Forms/VehicleBrand.cshtml");
          }

        }
      </div>
      <div class="modal-footer">
        <nav class="navbar navbar-inverse" role="navigation">
          <ul class="nav navbar-nav navbar-right">
            <li><a class="btn" data-toggle="modal" data-target=".RefBransForm">Сохранить</a></li>
            <li><a class="btn" data-toggle="modal" data-target=".RefBransForm">Закрыть</a></li>
            <li><span>&nbsp;&nbsp;&nbsp;</span></li>
          </ul>
        </nav>
      </div>
    </div>
  </div>
</div>
@{
  if (id == 1)
  {
    @await Html.PartialAsync("Ref_VehicleBrands", ViewData)
  } else if (id == 2)
  {
      @Html.Partial("VehicleModels")
  }
}

@model ContosoUniversity.Models.Student

@model SBDR.Models.Select_Ref_VehicleBrands

@model SBDR.Models.Select_Ref_VehicleBrands