Securing login credentials for SAP .Net Connector

I have a .Net client application that connects to SAP and reads data provided by a BAPI. It is working fine but I am trying to answer question whether the username and password i am sending over to connect to SAP are actually sent in plain text or encrypted somehow. I couldn't find any reference for that in documentation of classes RfcConfigParameters and RfcDestinationManager.

I'm using code similar to the following:

//Set all connection parameters including user name and password in RfcConfigParameters object

RfcDestinationManager.RegisterDestinationConfiguration(objDestConfig);

RfcDestination destination = RfcDestinationManager.GetDestination(CON_NAME);

If it is true that credentials are sent as plain text, is there a more secure alternative?

Thank you

Sameh