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copied!<p>The button HTML from the PayPal site is embedded in a form tag. You can only have one form on an ASP.NET page and ASP.NET provides its own. If you have a master page, then the form tag is in there and it is applied to every page in the site when they are merged with the master at runtime.</p> <p>I found an <a href="http://jerschneid.blogspot.com/2007/03/hide-form-tag-but-leave-content.html" rel="nofollow">elegant solution</a> on Jeremy Schneider's blog that consists of a custom HtmlForm class that can have the form tag rendering toggled on and off. The class is called GhostForm and has a property, RenderFormTag. When RenderFormTag is set to false, it doesn't render the opening or closing tags, but does render all of the contents. Reference the custom GhostForm class and in the code-behind of the form on which you are placing the button, place the following in the Page_Load to disable the master page form tag:</p> <p>Usage:</p> <pre><code>public partial class Products : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { GhostForm mainForm = new GhostForm(); mainForm.RenderFormTag = false; ..... } // Send your data to PayPal :-) ..... } </code></pre> <p><strong>IMPORTANT:</strong> make sure you are signed into the sandbox BEFORE sending this request.</p> <p><strong>UPDATE:</strong> Check out these instructional videos: <a href="http://www.asp.net/mvc/videos/mvc-1/aspnet-mvc-storefront/aspnet-mvc-storefront-part-1-architectural-discussion-and-overview" rel="nofollow">http://www.asp.net/mvc/videos/mvc-1/aspnet-mvc-storefront/aspnet-mvc-storefront-part-1-architectural-discussion-and-overview</a></p> <p>Like you, I used the IPN code from John Mendez. Here's where I send and receive from PayPal:</p> <pre><code>string strSandbox = "https://www.sandbox.paypal.com/cgi-bin/webscr"; HttpWebRequest req = (HttpWebRequest)WebRequest.Create(strLive); //Set values for the request back to PayPal req.Method = "POST"; req.ContentType = "application/x-www-form-urlencoded"; byte[] param = Request.BinaryRead(HttpContext.Current.Request.ContentLength); string strRequest = Encoding.ASCII.GetString(param); strRequest += "&cmd=_notify-validate"; req.ContentLength = strRequest.Length; //Send the request to PayPal StreamWriter streamOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII); streamOut.Write(strRequest); streamOut.Close(); // Get the response from PayPal StreamReader streamIn = new StreamReader(req.GetResponse().GetResponseStream()); string strResponse = streamIn.ReadToEnd(); streamIn.Close(); </code></pre> <p>Hopefully this helps. 500 errors could be anything...</p>

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