title: how to POST data to external URL in MVC4 using server side
body: <p>Simple question:</p>
  
  <p>Now I have that form in my view:</p>
  
  <pre><code>&lt;form action="https://www.xyz.com/xyz/ISO/NewPayment"
  method="post" name="payform"&gt;
  
      &lt;input type="hidden" name="session_id" value="@Model.OrderId"&gt;
      &lt;input type="submit" value="Pay"&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>It send POST data and redirect user to <code>https://www.xyz.com/xyz/ISO/NewPayment</code>. </p>
  
  <p>So simple, but I want to check on server side correctness of that data, before user will be redirected to a external URL.</p>
  
  <p>How can I do this in asp.net MVC? How can I send POST data from server side, and then redirect user?</p>
  
  <p>Regards</p>