Xamarin Android Main Activity example for starting an IntentService.

MainActivity.cs

using System.IO;
using Android.App;
using Android.Content;
using Android.Widget;
using Android.OS;
using TIG.Todo.Common;
using Android.Content.PM;
using TIG.Todo.Common.SQLite;

namespace TIG.Todo.AndroidApp
{
	[Activity (Label = "TIG.Todo.Android", MainLauncher = true, ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.ScreenSize)]
	public class MainActivity : Activity
	{
		private TaskManager taskManager;

		protected override void OnCreate (Bundle bundle)
		{
			base.OnCreate (bundle);

			// Set our view from the "main" layout resource
			SetContentView (Resource.Layout.Main);

			//Intent intent = new Intent (this, typeof(GeofencingHelper));
			StartService(new Intent("com.sdtig.Todo.START_LOCATION"));
		}
	}
}