public static async void ExportMeasurementData(MeasurementModel measurement)
        {
            var savePicker = new Windows.Storage.Pickers.FileSavePicker();
            
            StorageFolder resultFolder = await ApplicationData.Current.LocalFolder.GetFolderAsync("Evaluation");
            StorageFolder resultFolder2 = await resultFolder.GetFolderAsync("Accelerometer");
            StorageFile resultFile = await resultFolder2.GetFileAsync(measurement.Filename);

            //await resultFile.CopyAsync(Windows.Storage.KnownFolders.DocumentsLibrary, "e" + measurement.AccelerometerFilename);

            savePicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.DocumentsLibrary;
            // Dropdown of file types the user can save the file as
            savePicker.FileTypeChoices.Add("Binary-Datei", new List<string>() { ".bin" });
            // Default file name if the user does not type one in or select a file to replace
            savePicker.SuggestedFileName = "e" + measurement.Filename;
            savePicker.PickSaveFileAndContinue();
        }
        private void ExportMeasurement(MeasurementViewModel measurementViewModel)
        {
            // Show loader
            _mainPage.ShowLoader();
            //_mainPage.ExportMeasurementData(measurementViewMdel.Id);

            if (measurementViewModel.Id != null && measurementViewModel.Id.Length > 0)
            {
                MeasurementModel measurement = _mainPage.GlobalMeasurementModel.GetMeasurementById(measurementViewModel.Id);
                if (measurement != null)
                {
                    var savePicker = new Windows.Storage.Pickers.FileSavePicker();
                    savePicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.DocumentsLibrary;
                    // Dropdown of file types the user can save the file as
                    savePicker.FileTypeChoices.Add("Binary-File", new List<string>() { ".bin" });
                    // Default file name if the user does not type one in or select a file to replace
                    savePicker.SuggestedFileName = String.Format("{0}_{1:yyyy-MM-dd_HH-mm-ss}", measurement.Setting.Name, measurement.StartTime);
                    // Open the file picker and call the method "ContinueFileSavePicker" when the user select a file.
                    savePicker.PickSaveFileAndContinue();
                }
            }
            // Hide loader
            _mainPage.HideLoader();
        }