public static void Run()
        {
            // ExStart:1
            // The path to the documents directory.
            string dataDir = RunExamples.GetDataDir(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);

            // Create an instance of Workbook class by loading the existing spreadsheet
            Workbook workbook = new Workbook(dataDir + "aspose-sample.xlsx");

            // Get the cells collection of worksheet by name Columns
            Cells cells = workbook.Worksheets["Columns"].Cells;

            // Copy the first 3 columns 7th column
            cells.CopyColumns(cells, 0, 6, 3);

            // Save the result on disc
            workbook.Save(dataDir + "output_out.xlsx");
            // ExEnd:1
        }
        public static void Run()
        {
            //Source directory
            string sourceDir = RunExamples.Get_SourceDirectory();

            //Output directory
            string outputDir = RunExamples.Get_OutputDirectory();

            // Create an instance of Workbook class by loading the existing spreadsheet
            Workbook workbook = new Workbook(sourceDir + "sampleCopyingMultipleColumns.xlsx");

            // Get the cells collection of worksheet by name Columns
            Cells cells = workbook.Worksheets[0].Cells;

            // Copy the first 3 columns 7th column
            cells.CopyColumns(cells, 0, 6, 3);

            // Save the result on disc
            workbook.Save(outputDir + "outputCopyingMultipleColumns.xlsx");

            Console.WriteLine("CopyingMultipleColumns executed successfully.");
        }