Create an unsuscribe link in my mass email application

Dear All,
I have implemented a bulk mailing page as follows:
My sendnewsletter.aspx file
<asp:Button ID="btnBind" runat="server" Text="View" OnClick="btnBind_Click" /> <asp:Label ID="Label1" runat="server" Font-Bold="true" ForeColor="Green" Text="Total Customers:"> </asp:Label><asp:Label ID="lbltotalcount" runat="server" ForeColor="Red" Font-Size="Larger"></asp:Label> <asp:Button ID="btnSend" runat="server" Text="Send" OnClick="btnSend_Click" /> <asp:GridView ID="grvCustomers" runat="server"></asp:GridView> My sendnewsletter.aspx.vb file

Imports System.Collections.Generic Imports System.Linq Imports System.W ...