Winforms DatagridView组合框中的问题选择值

我有分配给datagridview组合框的XML，其中有5个值，所有值都有相同的CountyName，但CountyID不同

  <CityCounty>
    <CountyID xmlns="http:// ">25</CountyID>
    <CountyName xmlns="http">Washington Township</CountyName>
    <StateID xmlns="http:">NJ</StateID>
    <TaxDistrictCode xmlns="http:// ">552</TaxDistrictCode>
  </CityCounty>

  <CityCounty>
    <CountyID xmlns="http: ">26</CountyID>
    <CountyName xmlns="http">Washington Township</CountyName>
   <StateID xmlns="http: ">NJ</StateID>
    <TaxDistrictCode xmlns="http">553</TaxDistrictCode>
  </CityCounty>

  <CityCounty>
    <CountyID xmlns="http: ">27</CountyID>
    <CountyName xmlns="http">Washington Township</CountyName>
   <StateID xmlns="http: ">NJ</StateID>
    <TaxDistrictCode xmlns="http">553</TaxDistrictCode>
  </CityCounty>

  <CityCounty>
    <CountyID xmlns="http: ">28</CountyID>
    <CountyName xmlns="http">Washington Township</CountyName>
   <StateID xmlns="http: ">NJ</StateID>
    <TaxDistrictCode xmlns="http">554</TaxDistrictCode>
  </CityCounty>

  <CityCounty>
    <CountyID xmlns="http: ">29</CountyID>
    <CountyName xmlns="http">Washington Township</CountyName>
   <StateID xmlns="http: ">NJ</StateID>
    <TaxDistrictCode xmlns="http">555</TaxDistrictCode>
  </CityCounty>

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但是无论我从下拉列表中选择的值是什么，对于上面的

字符串testid

，我都会得到相同的CountyID 28。我应该为每个值得到不同的CountyID，但我得到的是相同的CountyID，所以任何人都可以建议我做错了什么，并提出一些解决方案。提前谢谢

如何准备

数据源

-发布一些代码…在调用此代码时发布相同的（编辑的）代码？哪个事件？我在页面加载时将值分配给组合框，并获取下拉dgvGridName_CellValueChanged事件的值。

List<ClassCityCounty> cityCountyList1;
var s = new XmlSerializer(typeof(List<CityCounty>));
var path = EnvironmentPath.GetEnvironmentPath() + @"\XML\CityCounty.xml";
    var r = new StreamReader(@path);
    cityCountyList1 = (List<CityCounty>)s.Deserialize(r);
    r.Close();

DataGridViewComboBoxCell dgvCbo = dgvGridName[colindex, rowindex] as DataGridViewComboBoxCell;
dgvCbo.DataSource = cityCountyList1; //list value - parsed from XML
dgvCbo.DisplayMember = Constants.CITYCOUNTYNAME;
dgvCbo.ValueMember = Constants.COUNTYID;

string testid = dgvGridName.CurrentRow.Cells[colindex].Value.ToString()