private void ClientsToExcelCommandMethod()
 {
     if (ClientList != null && ClientList.Any())
     {
         ExternalFilesLa.ToExcel(ClientList);
     }
 }
        private void OpenFile_FileOk(object sender, System.ComponentModel.CancelEventArgs e)
        {
            var dialog = sender as OpenFileDialog;

            if (dialog != null)
            {
                SelectedFilePath = dialog.FileName;
            }
            ChargeOnList = ExternalFilesLa.OpenSourseFile(SelectedFilePath);
        }