post data to another URL in codebehind

hi guys, i wonder how can i post data to another URL in codebehind..
below is my original code..
<form method="post" name="ePayment" action="https://www.mickey.com/ePayment/receive.asp"> <input type="hidden" name="MerchantCode" value="dd3ds45" /> <input type="hidden" name="RefNo" value="10001" /> <input type="hidden" name="Amount" value="100.00" /> <input type="submit" value="Proceed" name="Submit" id="Submit1" onclick="return Submit1_onclick()" /> </form>