CancelEnvelope - C#

// DocumentNOW V2 CancelEnvelope example

// force TLS 1.2 if .net < 4.6
ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;
    
Guid accountContextID = new Guid(<fromYourAccount>);
Guid envelopeId = new Guid(<fromCreateEnvelope>);
Guid authToken = new Guid(<fromCreateEnvelope>);

// assuming we set the namespace on the service proxy to DocNow ...
DocNow.EnvelopeServiceClient client = new DocNow.EnvelopeServiceClient("BasicHttpBinding_IEnvelopeService1");
DocNow.CancelEnvelopeRequest request = new DocNow.CancelEnvelopeRequest();

request.ContextIdentifier = accountContextID;
request.EnvelopeId = envelopeId
request.AuthToken = authToken;
request.Remarks = "Cancelling because of so and so ...";

DocNow.CancelEnvelopeResult result = client.CancelEnvelope(request);

if (result.Exceptions != null)
{
    StringBuilder sb = new StringBuilder();
    foreach (DocNow.EnvelopeException exception in result.Exceptions)
    {
        sb.AppendFormat("{0} : {1}{2}", exception.Severity.ToString(), exception.Value, Environment.NewLine);
    }
    Console.WriteLine(sb.ToString());
}
else
{
    // the result will return back result.EnvelopeId as confirmation
}