How can I get the current location using Input.Location from the background worker?

if (_backgroundWorker != null) _backgroundWorker.CancelAsync();

     _backgroundWorker = new BackgroundWorker();

     _backgroundWorker.DoWork += (o, a) =>
     {
         // executed on background thread
         // do slow running computationaly intense work, check periodically 
         // if (a.IsCanceled) return;

         // assign result as 
         // a.Result = a.Argument+"!";
         while (true)
         {
            //Here I want to get the location
           //Below two lines give me the error like get_lastData can only be called from the main thread.
           //Constructors and field initializers will be executed from the loading thread when loading a scene.
    startLat = Input.location.lastData.latitude;
     startLng = Input.location.lastData.longitude;
             Thread.Sleep(5000);
         }
     };
     _backgroundWorker.RunWorkerCompleted += (o, a) =>
     {
         // executed on main thread
         // you can use a.Result

     };
     _backgroundWorker.RunWorkerAsync("A1");

     if (_backgroundWorker != null) _backgroundWorker.Update();

**Trying to get the current latitude and longitude from the background worker but it gives me error like : get_lastData can only be called from the main thread. Constructors and field initializers will be executed from the loading thread when loading a scene.

I am new to Unity so please suggest some ideas to get current location when the app is not in foreground. **