private void LoadProject_OnClick(object sender, RoutedEventArgs e) { OpenFileDialog dialog = new OpenFileDialog { DefaultExt = FILE_NAME_EXTENSION, Filter = "Fluent Interface Creator projects (*.ficp)|*.ficp" }; bool?result = dialog.ShowDialog(this); if (result == true) { _projectEditorViewModel.LoadProjectFromXML(File.ReadAllText(dialog.FileName)); } }