bool Validate() { if (notebook.Page == 2) { if (fileChooser.Filename == null || fileChooser.Filename.Length == 0 || !File.Exists(fileChooser.Filename)) { return(true); } importedImageFile = project.ImportFile(fileChooser.Filename); if (importedImageFile != null) { importedImageFile = WidgetUtils.AbsoluteToRelativePath(project.ImagesRootPath, importedImageFile); } return(importedImageFile != null); } return(true); }