public void Application_WorkbookOpen(Workbook Doc) { Sheets sheets = Doc.Worksheets; connections con = new connections(); funcionesEspeciales fe = new funcionesEspeciales(); foreach (Worksheet sheet in sheets) { if (fe.ReadProperty("conexionSeleccionada", sheet.CustomProperties) != null) { DocEvents_ChangeEventHandler EventDel_CellsChange = new DocEvents_ChangeEventHandler(con.WorksheetChangeEventHandler); sheet.Change += EventDel_CellsChange; } } }