Submit multiple fields to email from form

I've created a simple form to email, but want to split the responses in the email that is recieved ie,

Body    (txtBody)
Sub Body 1   (txtBody1)
Sub Body  2  (txtBody2)
 and so on.

My code is:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="mail.aspx.vb" Inherits="_mail" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>How to Send Email using ASP.NET 4.0 and VB.NET</title> <style type="text/css"> <!-- body { margin-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; } a:link { color: #0000FF; } a:visited { color: #0000FF; } a:hover { color: #0000FF; text-decoration: none; } a:active { color: #0000FF; } .basix { font-family: Verdana, Aria ...