using System; namespace LBOutlookLibrary { public partial class LBApplicationClass { public LBMailItemClass CreateMailItem() => new LBMailItemClass(CreateItem(LBOlItemType.olMailItem)); } public partial class LBMailItemClass { public void AddAttachment(string filename) => Attachments.Add(filename, LBOlAttachmentType.olByValue, Type.Missing, Type.Missing); } }