从复合主键编辑键字段，显示错误

Question

型号： -

  public partial class tblMake
    {
    [Key]
    [Column(Order = 0)]
    [StringLength(10)]
    [Display(Name = "Company Code")]
    public string Company_Code { get; set; }
    [Key]
    [Column(Order = 1)]
    [StringLength(20)]
    [Display(Name = "Make Code")]
    public string Make_Code { get; set; }
    [StringLength(60)]
    [Display(Name = "Description")]
    public string Description { get; set; }
    [StringLength(255)]
    [Display(Name = "Remark")]
    public string Remark { get; set; }
   }

查看： -

    @Html.ValidationSummary(true)
    @Html.HiddenFor(model => model.Company_Code)

    <div class="form-group">
        <label for="text" style="float: left; width: 200px; ">Make Code :</label>

        <div class="input-group">
            @Html.TextBoxFor(model => model.Make_Code, new { style = "width:200px" })
            @Html.ValidationMessageFor(model => model.Make_Code)
        </div>
    </div>

    <div class="form-group">
        <label for="text" style="float: left; width: 200px; ">Description :</label>

        <div class="input-group">
            @Html.TextBoxFor(model => model.Description, new { style = "width:600px" })
            @Html.ValidationMessageFor(model => model.Description)
        </div>
    </div>

    <div class="form-group">
        <label for="text" style="float: left; width: 200px; ">Remark :</label>
        <div class="input-group">
            @Html.TextAreaFor(model => model.Remark, new { style = "width:800px;height: 150px;" })


            @Html.ValidationMessageFor(model => model.Remark)
        </div>
    </div>

当我尝试编辑'Make Code';这是复合主键的一部分时，它带有错误（插入换行符以便于阅读）： -

System.Data.Entity.Core.OptimisticConcurrencyException:
  Store update, insert, or delete statement affected an unexpected number of rows (0).
  Entities may have been modified or deleted since entities were loaded.
  Refresh ObjectStateManager entries.

任何人都可以解释该做什么吗？