you can take a look at http://blog.atcp.us/2013/11/10/talking-to-cisco-routers-switches-firewalls-with-renci-sshnet/
or http://stackoverflow.com/questions/23703040/download-files-from-sftp-with-ssh-net-library
depends on what you want to do
or http://stackoverflow.com/questions/23703040/download-files-from-sftp-with-ssh-net-library
depends on what you want to do