AirplaneModeService.cs

public class AirplaneModeService
{
	public bool Toggle (Context context)
	{
		bool isEnabled = IsAirplaneModeOn (context);
		// Toggle airplane mode.
		SetSettings (context, isEnabled ? 1 : 0);
		// Post an intent to reload.
		Intent intent = new Intent (Intent.ActionAirplaneModeChanged);
		intent.PutExtra ("state", !isEnabled);
		context.SendBroadcast (intent);
		return true;
	}

	public static bool IsAirplaneModeOn (Context context)
	{
		if (Build.VERSION.SdkInt < Build.VERSION_CODES.JellyBeanMr1) {
			return Settings.System.GetInt (context.ContentResolver, 
				Settings.System.AirplaneModeOn, 0) != 0;          
		} else {
			return Settings.Global.GetInt (context.ContentResolver, 
				Settings.Global.AirplaneModeOn, 0) != 0;
		}       
	}

	/// <summary>
	/// Sets the Airplane mode
	/// </summary>
	/// <param name="context">Context</param>
	/// <param name="value">1 for On; 0 off</param>
	public static void SetSettings (Context context, int value)
	{
		if (Build.VERSION.SdkInt < Build.VERSION_CODES.JellyBeanMr1) {
			Settings.System.PutInt (
				context.ContentResolver,
				Settings.System.AirplaneModeOn, value);
		} else {
			Settings.Global.PutInt (
				context.ContentResolver,
				Settings.Global.AirplaneModeOn, value);
		}       
	}
}