GeocodeManager_2.cs

public void NearbySearch(LatLng currentLocation, string searchText)
{
     ISearchService searchService = SearchServiceFactory.Create(activity, Android.Net.Uri.Encode("YOUR_API_KEY"));
     NearbySearchRequest nearbySearchRequest = new NearbySearchRequest();
     nearbySearchRequest.Query = searchText;
     nearbySearchRequest.Language = "en";
     nearbySearchRequest.Location = new Coordinate(currentLocation.Latitude, currentLocation.Longitude);
     nearbySearchRequest.Radius = (Integer)2000;
     nearbySearchRequest.PageIndex = (Integer)1;
     nearbySearchRequest.PageSize = (Integer)5;
     nearbySearchRequest.PoiType = LocationType.Address;
     searchService.NearbySearch(nearbySearchRequest, new QuerySuggestionResultListener(activity as MainActivity));
}