gridview将下拉列表绑定到List <keyvaluePair <int,string >>

List<KeyValuePair<int, string>> dataSource = new List<KeyValuePair<int, string>>();
dataSource.Add(new KeyValuePair<int, string>(1, "Option 1"));
dataSource.Add(new KeyValuePair<int, string>(2, "Option 2"));
dataSource.Add(new KeyValuePair<int, string>(3, "Option 3"));

TemplateField templateField = new TemplateField();
templateField.HeaderText = "Options";
templateField.ItemTemplate = new DropDownListTemplate();

public class DropDownListTemplate : ITemplate
{
    public void InstantiateIn(Control container)
    {
        DropDownList dropDownList = new DropDownList();
        dropDownList.DataTextField = "Value";
        dropDownList.DataValueField = "Key";
        dropDownList.DataSource = dataSource;
        dropDownList.DataBind();
        container.Controls.Add(dropDownList);
    }
}

GridView1.Columns.Add(templateField);