services.AddDbContext(c => c.UseSqlServer(Configuration.GetValue("ConnectionString") ,x => x.UseNetTopologySuite()));

 var currentLocation = new Point(dto.Lat, dto.Lng) { SRID = 4326 };
 queryRow = YOURCONTEXT.YOURTABLE.find(id);
 queryRow.Distance = queryRow.Location.Distance(currentLocation)