public void registerSaveEvent()
		{
			Document doc = this.ActiveUIDocument.Document;
			doc.DocumentSaving += new EventHandler<DocumentSavingEventArgs>(myDocumentSaving);
		}
		
		private void myDocumentSaving(object sender, DocumentSavingEventArgs args)
		{
			Document doc = sender as Document;
			string user = doc.Application.Username;
			string filename = doc.PathName;
			string filenameShort = Path.GetFileNameWithoutExtension(filename);
			string tempFolder = Path.GetTempPath();
			string outputFile = Path.Combine(tempFolder,filenameShort + ".txt");
			using (StreamWriter sw = new StreamWriter(outputFile,true))
			{
				sw.WriteLine(DateTime.Now + ": " + user);
			}
		}