REST Update Recipient Email using PUT Method - api

Question

I am new to REST and keep getting the Bad Request 400 Response with the code below:
I have the standard baseURL and authenticateStr from the other sample...
_recipientID, pNewEmail, pNewName and pNewRoutingOrder are passed in as parameters to the procedures.
string envDef = "<envelopeDefinition xmlns=\"http://www.docusign.com/restapi\">" +
"<signers>" +
"<signer>" +
"<recipientId>" + _recipientId + "</recipientId>" +
"<email>" + pNewEmail + "</email>" +
"<name>" + pNewName + "</name>" +
"<routingOrder>" + pNewRoutingOrder + "</routingOrder>" +
"</signer>" +
"</signers>" +
"</envelopeDefinition>";
url = baseURL + "/envelopes/" + pEnvelopeID + "/recipients";
request = (HttpWebRequest)WebRequest.Create(url);
request.Headers.Add("X-DocuSign-Authentication", authenticateStr);
request.ContentType = "application/xml";
request.Accept = "application/xml";
request.ContentLength = envDef.Length;
request.Method = "PUT";
// write the body of the request
byte[] body = System.Text.Encoding.UTF8.GetBytes(envDef);
Stream dataStream = request.GetRequestStream();
dataStream.Write(body, 0, envDef.Length);
dataStream.Close();
// read the response
webResponse = (HttpWebResponse)request.GetResponse();
sr.Close();
responseText = "";
sr = new StreamReader(webResponse.GetResponseStream());
responseText = sr.ReadToEnd();

Answer 1

Ok just figured out how to do this. Here's an XML request body that can be used to update the email and name of a recipient, for instance. I just verified that this works!
<recipients xmlns="http://www.docusign.com/restapi">
<signers>
<signer>
<recipientId>1</recipientId>
<email>email#docusign.com</email>
<name>Joe Mama</name>
</signer>
</signers>
</recipients>