Service.txt

1-- define service
 [Service]
   
    public class DemoIntentService : IntentService
    {
        public DemoIntentService() : base("DemoIntentService")
        {
        }

        protected override void OnHandleIntent(Android.Content.Intent intent)
        {

        }
        public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
        {
            // start a task here
            new Task(() =>
            {
                // long running code
                while (true)
                {  
                Intent intents = new Intent();
                    intents.SetAction("com.alr.text");
                    intents.PutExtra("MyData", "Data from Activity1");
                SendBroadcast(intents);
           
                    System.Threading.Thread.Sleep(1000);
                }
            }).Start();
            return StartCommandResult.Sticky;
        }

    }

2-- start service
 this.StartService(new Intent(this, typeof(DemoIntentService)));


3-- register service if needed
  <service
        android:name=".DemoIntentService"
        android:exported="false" >
  </service>