ASP.Net HyperLink: Add multiple recepients from database to HTML mailto

I know if we place href in item template in asp:template field within columns the href will be available  for each row. I am looking to have only one href for the whole grid so that it get's all employee id's that are binded to the grid. Please find the code below

<asp:GridView>
<columns>
...
<asp:TemplateField HeaderText="Send Mail">
       <ItemTemplate>
        <a href='mailto:<%#Eval("EMP_ID").ToString().Trim()%>?CC=<%#Eval("EMP_ID").ToString().Trim()%>&SUBJECT=<%#Eval("EMP_ID").ToString().Trim()%>RE: Test' target="_blank">Send mail</a>
       </ItemTemplate>
       </asp:TemplateField> 
</columns>  
</asp:GridView>

<asp:GridView>
<columns>
...
<asp:TemplateField HeaderText="Send Mail">
       <ItemTemplate>
        <a href='mailto:<%#Eval("EMP_ID").ToString().Trim()%>?CC=<%#Eval("EMP_ID").ToString().Trim()%>&SUBJECT=<%#Eval("EMP_ID").ToString().Trim()%>RE: Test' target="_blank">Send mail</a>
       </ItemTemplate>
       </asp:TemplateField> 
</columns>  
</asp:GridView>