C# use Devcon.exe

            Process p = new Process();
            p.StartInfo.CreateNoWindow = true;
            p.StartInfo.FileName = "cmd.exe";
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardError = true;
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.Start();
            p.StandardInput.WriteLine("c:\\devcon rescan");
            p.Close();