Referencing Excel cell and range in C# and VB.NET

using GemBox.Spreadsheet;

class Program
{
    static void Main()
    {
        // If using Professional version, put your serial key below.
        SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY");

        var workbook = new ExcelFile();
        var worksheet = workbook.Worksheets.Add("Cell Referencing");

        worksheet.Cells[0].Value = "Cell referencing examples:";

        worksheet.Cells["B2"].Value = "Cell B2.";
        worksheet.Cells[6, 0].Value = "Cell in row 7 and column A.";

        worksheet.Rows[2].Cells[0].Value = "Cell in row 3 and column A.";
        worksheet.Rows["4"].Cells["B"].Value = "Cell in row 4 and column B.";

        worksheet.Columns[2].Cells[4].Value = "Cell in column C and row 5.";
        worksheet.Columns["AA"].Cells["6"].Value = "Cell in AA column and row 6.";

        // Referencing Excel row's cell range.
        var cellRange = worksheet.Rows[7].Cells;

        cellRange[0].Value = cellRange.IndexingMode.ToString();
        cellRange[3].Value = "D8";
        cellRange["B"].Value = "B8";

        // Referencing Excel column's cell range.
        cellRange = worksheet.Columns[7].Cells;

        cellRange[0].Value = cellRange.IndexingMode.ToString();
        cellRange[2].Value = "H3";
        cellRange["5"].Value = "H5";

        // Referencing arbitrary Excel cell range.
        cellRange = worksheet.Cells.GetSubrange("I2", "L8");
        cellRange.Style.Borders.SetBorders(MultipleBorders.Outside, SpreadsheetColor.FromArgb(0, 0, 128), LineStyle.Dashed);

        cellRange["J7"].Value = cellRange.IndexingMode.ToString();
        cellRange[0, 0].Value = "I2";
        cellRange["J3"].Value = "J3";
        cellRange[4].Value = "I3"; // Cell range width is 4 (I J K L).

        // Set column widths and some print options (for better look when exporting to PDF, XPS and printing).
        var columnWidths = new double[] { 175, 174, 174, 24, double.NaN, double.NaN, double.NaN, 54, 19, 81 };
        for (int i = 0; i < columnWidths.Length; i++)
            if (!double.IsNaN(columnWidths[i]))
                worksheet.Columns[i].SetWidth(columnWidths[i], LengthUnit.Pixel);

        worksheet.PrintOptions.PrintGridlines = true;
        worksheet.PrintOptions.PrintHeadings = true;

        workbook.Save("Cell Referencing.%OutputFileType%");
    }
}