Desarrollo

using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Text;

namespace ManejarBluetooth
{
  public class BluetoothMS
  {
    public enum RadioMode
      {
        Apagado = 0,Conectable = 1,Descubrible =2
      }

    /// <summary>
    /// Recuperar el modo
    /// </summary>
    [DllImport ("BthUtil.dll")]
    public static extern int BthGetMode (out RadioMode dwMode);

    /// <summary>
    /// Establecer el modo
    /// </summary>
    [DllImport("BthUtil.dll")]
    public static extern int BthSetMode(RadioMode dwMode);
    public int EstablecerModo(RadioMode Modo)
      {
        return BthSetMode(Modo);
      }

    public int RecuperarModo(out RadioMode Modo)
      {
        return BthGetMode(out Modo);
      }
  }
}

private const int POWER_STATE_SUSPEND = 0x00200000;
private const int POWER_FORCE = 0x00001000;

[DllImport("coredll.dll")]
internal static extern int SetSystemPowerState(string psState, int StateFlags, int Options);

//Esta funcin llama a SetSystemPowerState para suspender la PDA
private void Apagar()
{
SetSystemPowerState(null, POWER_STATE_SUSPEND, POWER_FORCE);
}

(...)