private void btnExcel_Click(object sender, EventArgs e)
 {
     try {
         bll.ExportProveedoresExcel();
         Notifications.FrmSuccess.SuccessForm(Helps.Language.SearchValue("excelOK") + "\n" + ConfigurationManager.AppSettings["FolderExcel"]);
     }
     catch (Exception ex)
     {
         Notifications.FrmError.ErrorForm(Helps.Language.SearchValue("excelError") + "\n" + ex.Message);
     }
 }