{
var processInfo = new ProcessStartInfo
{
    FileName = "sftp",
    Arguments = $"-P {port} {user}@{server}",
    RedirectStandardOutput = true,
    RedirectStandardInput = true,
    RedirectStandardError = true,
    StandardOutputEncoding = Encoding.UTF8,
    StandardErrorEncoding = Encoding.UTF8
};
_process = Process.Start(processInfo);
_writer = _process.StandardInput;
_process.BeginOutputReadLine();
_process.BeginErrorReadLine();

_process.OutputDataReceived += _process_OutputDataReceived;
_process.ErrorDataReceived += _process_ErrorDataReceived;

_writer.WriteLine("ls");
}

private void _process_OutputDataReceived(object sender, DataReceivedEventArgs e)
{
    if (string.IsNullOrWhiteSpace(e.Data))
        return;

    Console.WriteLine($"Msg: '{e.Data}'");
}

private void _process_ErrorDataReceived(object sender, DataReceivedEventArgs e)
{
    if (string.IsNullOrWhiteSpace(e.Data))
        return;

    Console.WriteLine($"Error: '{e.Data}'");
}