Hello all,   I am writing a payment gateway interface for a SA payment gateway, but they gave me a samle code for old ASP. I have attached it below. 

<form method="POST" action="https://gateway.netcash.co.za/vvonline/ccnetcash.asp ">
<input type="hidden" name="m_1" value="testuser">
<input type="hidden" name="m_2" value="testpass">
<input type="hidden" name="m_3" value="654321">
<input type="hidden" name="p1" value="0291">
<input type="hidden" name="p2" value="Uniquekkap">
<input type="hidden" name="p3" value="Example Goods">
<input type="hidden" name="p4" value="39.99">
<input type="hidden" name="p10" value="">
<input type="hidden" name="Budget" value="Y">
<input type="hidden" name="m_4" value="Extra 1">
<input type="hidden" name="m_5" value=" Extra 2">
<input type="hidden" name="m_6" value=" Extra 3">
<input type="hidden" name="m_9" value="jack@test.com">
<input type="hidden" name="m_10" value="page=returnpage.asp&CommId=123">
<input type="submit" value="Pay by Credit Card">
</form> 

Now, I need to convert this to ASP .Net, to use in a DNN app I am writeing.  Obviously if I create anothere DotNet form I get the error "A page can have only one server-side form tag."So how do I do this, Ihave gotten this far, I think I am not the right path,

But now what?And if I want the page  gateway to redirect back to the page that sent it how do I code that? i.e what replace this "returnURL" line.

Please help ASAP.

Thank you