Log file not generating.

c:\WinSCP\WinSCP3.exe /console /script="c:\EMT\AutoFTP.txt" /log="C:\EMT\winscp.log"

const string logname = "log.xml";
Process winscp = new Process();
winscp.StartInfo.FileName = "C:\\Program Files\\WinSCP\\winscp.com";
winscp.StartInfo.Arguments = "/log=C:\\"" + logname + "\"";
winscp.StartInfo.UseShellExecute = false;
winscp.StartInfo.CreateNoWindow = true;
winscp.Start();
winscp.StandardInput.WriteLine("option batch abort");
winscp.StandardInput.WriteLine("option confirm off");
winscp.StandardInput.WriteLine("open mysession");
winscp.StandardInput.WriteLine("ls");
winscp.StandardInput.Close();
 
string output = winscp.StandardOutput.ReadToEnd();
 
winscp.WaitForExit();
XPathDocument log = new XPathDocument(logname);
XmlNamespaceManager ns = new XmlNamespaceManager(new NameTable());
ns.AddNamespace("w", "http://winscp.net/schema/session/1.0");
XPathNavigator nav = log.CreateNavigator();
XPathNodeIterator files = nav.Select("//w:file", ns);
Console.WriteLine(string.Format("There are {0} files and subdirectories:", files.Count));
foreach (XPathNavigator file in files)
{
    Console.WriteLine(file.SelectSingleNode("w:filename/@value", ns).Value);
}