title: How to prevent editing of hidden field with PayPal's Website Payment Standard?
body: <p>I'm using PayPal's Website Payment Standard in my ASP.NET website.</p>
  
  <p>What I do is when the user clicks on the "Pay Now" button, I do the following in the codebhind:</p>
  
  <ol>
  <li>DB status changes</li>
  <li>Generation of the PayPal form, hidden fields for the items</li>
  <li>Call ScriptManager.RegisterClientScriptBlock() to call the javascript function that submits the PayPal form to PayPal.</li>
  </ol>
  
  <p>I'm worried that the user can press stop on the web browser and then edit the values in the hidden forms and then submit the form. Is there a way to prevent this? Or a better alternative?</p>
  
  <p>Thank you so much in advance!</p>