bind namevaluecollection gridview?

what kind collection i should modify namevalue collection bindable gridview?
when doing directly didn't work.

code aspx.cs

  private vacant bindlist(namevaluecollection nvplist)
  {
     resultgv.datasource = list;
     resultgv.databind();
  }

code aspx

<asp:gridview id="resultgv" runat="server" autogeneratecolumns="false" width="100%">
    <columns>
         <asp:boundfield datafield="key" headertext="key" />
         <asp:boundfield datafield="value" headertext="value" />
    </columns>
</asp:gridview>

any tip many welcome. thanks. x.