Replace HTML Page (File) with GridView content as Email Body and send Email using C# and VB.Net in ASP.Net

hi

I used gridview in page and I used code to send email :

gridview:

<asp:GridView ID="GridView3" runat="server" AutoGenerateColumns="false">
 <Columns>
   <asp:TemplateField ItemStyle-Width="24px" ItemStyle-VerticalAlign="Middle">
      <ItemTemplate>
           <asp:HyperLink ID="HPtemporary" runat="server" NavigateUrl='<%#Eval("DownLoadToken","http://Site.com/downloads/{0}")%>'>'<%#Eval("DownLoadToken","http://site.com/downloads/{0}")%>'</asp:HyperLink>
      </ItemTemplate>
   </asp:TemplateField>
 </Columns>
</asp:GridView>

AND:

  protected void SendEmail()
    {
        string body = this.PopulateBody(LblUsername.Text,
       "شماره پیگیری" + Lblrefid.Text);
        this.SendHtmlFormattedEmail("Email@gmail.com", "شماره پیگیری", body);
    }

    private string PopulateBody(string userName, string description)
    {
        string body = string.Empty;
        using (StreamReader reader = new StreamReader(Server.MapPath("~/EmailTemplate.htm")))
        {
            body = reader.ReadToEnd();
        }
        body = body.Replace("{UserName}", userName);
        body = body.Replace("{Description}", description);
        return body;
    }

now here In this line:

 string body = this.PopulateBody(LblUsername.Text,"شماره پیگیری" + Lblrefid.Text);

instead of Lblrefid.text I want put it send all row of grid view to email:

<asp:HyperLink ID="HPtemporary" runat="server" NavigateUrl='<%#Eval("DownLoadToken","http://Site.com/downloads/{0}")%>'>'<%#Eval("DownLoadToken","http://site.com/downloads/{0}")%>'</asp:HyperLink>

how I can do it?

Best regards

neda