Here's the complete code with proper error handling and structure: using System; using System.IO; using System.Reflection; using System.Threading.Tasks; using Microsoft.Extensions.Logging; namespace YourNamespace.Services { public class StationFinderService { private readonly IGoogleService _googleService; private readonly IDistanceToUtil _distanceToUtil; private readonly ILogger _logger; public StationFinderService( IGoogleService googleService, IDistanceToUtil distanceToUtil, ILogger logger) { _googleService = googleService; _distanceToUtil = distanceToUtil; _logger = logger; } public async Task FindClosestStationAsync(GoogleMapEntry googleMapEntry) { try { var findCountryByLatLong = await _googleService.GetCountry(googleMapEntry.Latitude, googleMapEntry.Longitude); if (!string.IsNullOrEmpty(findCountryByLatLong)) { using StreamReader r = new("Data/ashrae_data.json"); var stationData = GetAshraeListFromStreamReader(r, true); double currentDistance = -1; var closestStation = new AshraeStationEntity(); if (stationData.ContainsKey(findCountryByLatLong)) { foreach (var station in stationData[findCountryByLatLong]) { var distance = _distanceToUtil.DistanceTo( googleMapEntry.Latitude, googleMapEntry.Longitude, station.Latitude, station.Longitude); if (currentDistance < 0 || distance < currentDistance || distance == 0) { currentDistance = distance; closestStation = station; if (distance == 0) { break; // Exact match found, no need to continue } } } return closestStation; } } return null; } catch (Exception ex) { _logger.LogError( "Error finding closest station for {Latitude},{Longitude}. Error: {ErrorMessage}", googleMapEntry.Latitude, googleMapEntry.Longitude, ex.Message); throw; } } private Dictionary> GetAshraeListFromStreamReader(StreamReader reader, bool closeReader) { // Implement your JSON deserialization logic here throw new NotImplementedException(); } } public class GoogleMapEntry { public double Latitude { get; set; } public double Longitude { get; set; } } public class AshraeStationEntity { public double Latitude { get; set; } public double Longitude { get; set; } // Add other properties as needed } } namespace YourNamespace.Services { public interface IGoogleService { Task GetCountry(double latitude, double longitude); } } namespace YourNamespace.Services { public interface IDistanceToUtil { double DistanceTo(double lat1, double lon1, double lat2, double lon2); } }