The following code snippet can be used to run a command as if you are opening a DOS prompt and typing it in.

public static string MyDOSMethod()
        {
            ProcessStartInfo si = new ProcessStartInfo("cmd.exe");
            si.RedirectStandardInput = true;
            si.RedirectStandardOutput = true;
            si.UseShellExecute = false;

            Process p = Process.Start(si);
            p.StandardInput.WriteLine(@"cd \windows\system32");
            p.StandardInput.WriteLine("exit");

            try
            {
                return p.StandardOutput.ReadToEnd();
            }
            catch (Exception e)
            {
                return e.Message;
            }
        }