Do a gateway button for ordering

[TheWizardofInt]

Here is how I access my gateway in HTML:

<FORM METHOD=POST ACTION="https://secure.payment.com/cgi-bin/mas/buynow.cgi">
<INPUT type=hidden name="showaddr" value="1">
<input type=hidden name="1-desc" value="Product">
<input type=hidden name="1-cost" value="149.95">
<input type=hidden name="1-qty" value="1">
<INPUT type=hidden name="ret_addr" value="http://www.ihome_page.net/Order.htm">
<INPUT type=hidden name="mername" value="Merchant">
<INPUT type=hidden name="mertext" value="">
<INPUT type=hidden name="email_text" value="">
<INPUT type=hidden name="visaimage" value="1">
<input type=submit value="Buy The Pro!">
<INPUT type=hidden name="vendor_id" value="xx11xx">
<INPUT type=hidden name="home_page" value="http://www.homepage.net">We
take Master Card, VISA, American Express and Discovery 
<INPUT type=hidden name="mcimage" value="1">
<INPUT type=hidden name="ameximage" value="1">
<INPUT type=hidden name="discimage" value="1">
<INPUT type=hidden name="dinerimage" value="">
<INPUT type=hidden name=acceptcards value=1>
<INPUT type=hidden name=altaddr value=1>
</FORM>

I have no idea how to do this with an ASP.Net button

Any thoughts?