protected async Task RefreshClaims() { MyDB DB = new MyDB(); if (CrossConnectivity.Current.IsConnected) { try { App_activity_indicator.IsVisible = true; App_activity_indicator.IsRunning = true; string webaddress = Libraries.MobileConfig.GetWebAddress(Application.Current.Properties["campus"].ToString()) + string.Format("DataFinder.aspx?dataFormat=myclaims&empcode={0}&acad={1}&sem={2}", Application.Current.Properties["userno"], txt_year.SelectedItem.ToString(), txt_semester.SelectedItem.ToString().Substring(9, 1)); _client.Timeout = TimeSpan.Parse("00:00:15"); var content = await _client.GetStringAsync(webaddress); //await DisplayAlert("Content ", "Sem " + content, "OK"); var n = JsonConvert.DeserializeObject <List <Model.TeachingClaimModel> >(content); List <Model.TeachingClaimModel> TT_data = new List <Model.TeachingClaimModel>(n); if (TT_data.Count > 0) { DB.resetClaims(txt_year.SelectedItem.ToString()); DB.AddClaims(txt_year.SelectedItem.ToString(), content); } else { DB.resetClaims(txt_year.SelectedItem.ToString()); lv_claims.ItemsSource = null; } App_activity_indicator.IsVisible = false; App_activity_indicator.IsRunning = false; } catch (Exception ex) { //await DisplayAlert("Error!", "" + ex.Message, "OK"); DB.resetClaims(txt_year.SelectedItem.ToString()); lv_claims.ItemsSource = null; App_activity_indicator.IsVisible = false; App_activity_indicator.IsRunning = false; } } else { await DisplayAlert("Warning", "No Internet Connection", "OK"); } var list = JsonConvert.DeserializeObject <List <Model.TeachingClaimModel> >(DB.GetAllClaims(txt_year.SelectedItem.ToString())); List <Model.TeachingClaimModel> display_data = new List <Model.TeachingClaimModel>(list); lv_claims.ItemsSource = display_data; lv_claims.EndRefresh(); }