/// <summary>
        /// Import a text file into an existing Excel file, creates a new WorkSheet and
        /// populates the WorkSheet with comma delimited data from the text file. Note that
        /// the folder in this case is our database so in the method ImportFromTextFile the
        /// connection string has DATABASE which is set the current application's executable
        /// folder.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void cmdImportTextFileIntoWorkSheetOleDb_Click(object sender, EventArgs e)
        {
            var oleOperations = new OledbCode.Operations();
            var excelFileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "ImportFromTextFile.xlsx");
            var textFileName  = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Sample1.txt");
            var sheetName     = "Customers";

            if (oleOperations.ImportFromTextFile(excelFileName, textFileName, sheetName))
            {
                MessageBox.Show("Import done");
            }
            else
            {
                Dialogs.ExceptionDialog(oleOperations.LastException);
            }
        }