public string Dir(string strcmd)
{
    Process process = new Process();
    process.StartInfo.FileName = "cmd.exe";
    process.StartInfo.UseShellExecute = false;
    process.StartInfo.RedirectStandardInput = true;
    process.StartInfo.RedirectStandardOutput = true;
    process.StartInfo.RedirectStandardError = true;
    process.StartInfo.CreateNoWindow = true;
    process.Start();
    process.StandardOutput.DiscardBufferedData();
    process.StandardInput.WriteLine(strcmd);
    process.StandardInput.WriteLine("exit");
    process.WaitForExit();
    return process.StandardOutput.ReadToEnd();
}