public async static Task ExportToHtml(HelpRequestModel request, StorageFile file)
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("<!DOCTYPE html>\n");
            sb.Append("<html>\n");
            sb.Append("<head>\n<title>" + request.Title + "</title>\n</head>\n");
            sb.Append("<body>\n");
            sb.Append("<h1>" + request.Title + "</h1>\n");
            sb.Append("<img src=\"" + request.PictureUrl + "\" />\n");
            sb.Append("<p>" + request.Text + "</p>\n");
            sb.Append("</body>\n</html>");

            await FileIO.WriteTextAsync(file, sb.ToString());
        }
 public static async Task EditRequest(HelpRequestModel request, string sessionKey)
 {
     headers[sessionHeaderName] = sessionKey;
     await HttpRequester.Post(baseUrl + "edit", request, headers);
 }
        private async void HandleAddRequest(object obj)
        {
            
            try
            {
                if(string.IsNullOrEmpty(Title) || string.IsNullOrWhiteSpace(Title))
                {
                    ErrorMessage = "Enter a request title";
                    return;
                }

                if (string.IsNullOrEmpty(Text) || string.IsNullOrWhiteSpace(Text))
                {
                    ErrorMessage = "Enter a request text";
                    return;
                }

                var geolocator = new Geolocator();
                geolocator.DesiredAccuracy = PositionAccuracy.High;
         
                var position = await geolocator.GetGeopositionAsync();
                var coordinates = new CoordinatesModel()
                                      {
                                          Latitude = position.Coordinate.Latitude,
                                          Longitude = position.Coordinate.Longitude
                                      };

                var request = new HelpRequestModel()
                                  {
                                      Title = Title,
                                      Text = Text,
                                      PictureUrl = PictureUrl,
                                      Coordinates = coordinates
                                  };

                IsAddingRequest = true;
                OnPropertyChanged("IsAddingRequest");

                await HelpRequestsPersister.AddRequest(request, AccountManager.CurrentUser.SessionKey);
                NavigationService.Navigate(ViewType.MyRequests);
                NotificationsManager.ShowToastNotification("Request added");

            }
            catch (Exception ex)
            {
                ErrorMessage = "Unable to get location";

                IsAddingRequest = false;
                OnPropertyChanged("IsAddingRequest");
            }
        }