protected XdrDataWriter StartCallMessage(MemoryStream ms, RpcCredentials credentials, int procedure)
{
XdrDataWriter writer = new XdrDataWriter(ms);
writer.Write(_client.NextTransactionId());
writer.Write((int)RpcMessageType.Call);
RpcCallHeader hdr = new RpcCallHeader();
hdr.RpcVersion = RpcVersion;
hdr.Program = (uint)Identifier;
hdr.Version = (uint)Version;
hdr.Proc = procedure;
hdr.Credentials = new RpcAuthentication(credentials ?? new RpcNullCredentials());
hdr.Verifier = RpcAuthentication.Null();
hdr.Write(writer);
return(writer);
}