Renci.SshNet.SshClient.Dispose C# (CSharp) Method

        protected override void Dispose(bool disposing)
        {
            base.Dispose(disposing);

            if (_isDisposed)
                return;

            if (disposing)
            {
                if (_inputStream != null)
                {
                    _inputStream.Dispose();
                    _inputStream = null;
                }

                _isDisposed = true;
            }
        }

        private void LocalVmToolStripMenuItemClick(object sender, EventArgs e)
        {
            var connectionInfo = new PasswordConnectionInfo(host, 22, username, password);
            connectionInfo.AuthenticationBanner += ConnectionInfoAuthenticationBanner;
            connectionInfo.PasswordExpired += ConnectionInfoPasswordExpired;
            sshClient = new SshClient(connectionInfo);
            sshClient.ErrorOccurred += SshClientErrorOccurred;
            Log(string.Format("Connecting to {0}:{1} as {2}", connectionInfo.Host, connectionInfo.Port, connectionInfo.Username));

            try
            {
                sshClient.Connect();
                var tunnel = sshClient.AddForwardedPort<ForwardedPortLocal>("localhost", 20080, "www.google.com", 80);
                tunnel.Start();

            }
            catch (Exception ex)
            {
                Log(ex.ToString());
            }
            finally
            {
                sshClient.Dispose();
            }
            Log("Connected");
            sshClient.ForwardedPorts.ToList().ForEach(p => Log(string.Format("SSH tunnel: {0}:{1} --> {2}:{3}", p.BoundHost, p.BoundPort, p.Host, p.Port) ));
        }