Comments by I.A.Qureshi (Top 1 by date)

There is no property in the object "COREEnvelopeRealTimeRequest" for the Username/Password.
And also UserName/Password is not going to web service using given bellow statement

service.Credentials = new System.Net.NetworkCredential("my-user-name", "my-password");

So, for the client authentication how can we send UserName/Password to web service?