AddAndRemoveTask

#region Background Task management

        private async Task<bool> ConfigureBackgroundTaskAsync()
        {
            try
            {
                vm.IsBusy = true;
                vm.IsBusyMessage = "configuring Background Task";

                var accessStatus = await BackgroundExecutionManager.RequestAccessAsync();

                switch (accessStatus)
                {
                    case BackgroundAccessStatus.AllowedWithAlwaysOnRealTimeConnectivity:
                    case BackgroundAccessStatus.AllowedMayUseActiveRealTimeConnectivity:
                        await TaskHelpers.RegisterTaskAsync("FriendlyName", typeof(TaskClass).FullName, (uint) updateFrequency);
                        Debug.WriteLine($"Task is running every {updateFrequency} minutes");
                        return true;
                    case BackgroundAccessStatus.Unspecified:
                        Debug.WriteLine($"Task is currently NOT running");
                        await new MessageDialog(content: "You did not make a choice, please try again.").ShowAsync();
                        break;
                    case BackgroundAccessStatus.Denied:
                        Debug.WriteLine($"Task was DENIED access");
                        await
                            new MessageDialog("You've denied the app from updating in the background or you have too many background tasks already. " +
                                              "r\n\nGo to Phone Settings > Background Apps \r\n\nFind this app in the list and re-enable background tasks.").ShowAsync();
                        break;
                }

                return false;
            }
            catch (Exception ex)
            {
                await new MessageDialog($"Something went wrong configuring the background task. Error: {ex.Message}").ShowAsync();
                return false;
            }
            finally
            {
                vm.IsBusy = false;
                vm.IsBusyMessage = "";
            }
        }

        private async Task DisableTaskAsync()
        {
            try
            {
                vm.IsBusy = true;
                vm.IsBusyMessage = "unregistering background task...";

                //unregister the task and confirm to user it was successful
                if (await TaskHelpers.UnregisterTaskAsync("FriendlyName"))
                {
                    Debug.WriteLine($"Monitoring Task is currently NOT running");
                }
            }
            catch (Exception ex)
            {
                await new MessageDialog($"There was a problem disabling Monitoring Task. Error: {ex.Message}").ShowAsync();
            }
            finally
            {
                vm.IsBusyMessage = "";
                vm.IsBusy = false;
            }
        }