public void LoadCommands() { Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog { DefaultExt = ".xml", Filter = "Xml documents (.xml)|*.xml" }; if (dlg.ShowDialog() == true) { _commandsFileName = dlg.FileName; } Update(_pumpService.LoadCommands(_commandsFileName), _pumpService.LoadStates(_statesFileName)); }