async void OnRefresh(object sender, EventArgs e)
        {
            // Turn on network indicator
            IsBusy = true;
            try
            {
                var incidentCollection = await incidentManager.GetAll();

                foreach (Incident incident in incidentCollection)
                {
                    if (incidents.All(b => b.Id != incident.Id))
                    {
                        incidents.Add(incident);
                    }
                }
            }
            catch
            {
                await DisplayAlert("Cannot Connect", "Either you are offline or the site is down.", "Ok");
            }
            finally
            {
                IsBusy = false;
            }
        }