//events
private void OpenFile_OnClick(object sender, RoutedEventArgs e)
{
(_fileName, Title) = SaveService.OnOpenFile();
if (!File.Exists(_fileName))
{
MessageBox.Show("Unable to open file", "Error", MessageBoxButton.OK);
return;
}
NotepadField.Text = File.ReadAllText(_fileName);
SaveStatusUpdate(true);
}