Public Shared Sub CreateSpreadsheetAndSaveToXlsxFile(outXlsxFilename As String)
    ' create a spreadsheet editor for synchronous editing of new spreadsheet document
    Using editor As SpreadsheetEditor = SpreadsheetEditor.CreateEditor()
        ' start the spreadsheet editing
        editor.StartEditing()

        ' get the first worksheet (empty)
        Dim sheet As Worksheet = editor.Document.Worksheets(0)
        editor.RenameWorksheet(0, "Multiplication table")

        ' fill the multiplication table (starts from "B2" cell)
        FillMultiplicationTable(editor, sheet, 1, 1, 1, 20)

        ' finish the spreadsheet editing
        editor.FinishEditing()

        ' save created spreadsheet as XLSX file
        editor.SaveAs(outXlsxFilename)
    End Using
End Sub

''' <summary>
''' Fills the multiplication table.
''' </summary>
''' <param name="editor">The spreadsheet editor.</param>
''' <param name="sheet">The sheet.</param>
''' <param name="columnIndex">Index of the column.</param>
''' <param name="rowIndex">Index of the row.</param>
''' <param name="firstNumber">The first number.</param>
''' <param name="lastNumber">The last number.</param>
Private Shared Sub FillMultiplicationTable(editor As SpreadsheetEditor, sheet As Worksheet, columnIndex As Integer, rowIndex As Integer, firstNumber As Integer, lastNumber As Integer)
    ' fill table

    Dim size As Integer = lastNumber - firstNumber
    For x As Integer = 0 To size
        Dim xReference As New CellReference(columnIndex + x + 1, rowIndex)

        editor.SetCellValue(sheet, columnIndex + x + 1, rowIndex, (firstNumber + x).ToString())
        editor.SetCellValue(sheet, columnIndex, rowIndex + x + 1, (firstNumber + x).ToString())
        For y As Integer = 0 To size
            Dim yReference As New CellReference(columnIndex, rowIndex + y + 1)
            Dim currentReference As New CellReference(xReference.ColumnIndex, rowIndex + y + 1)
            editor.SetCellValue(sheet, currentReference, String.Format("={0}*{1}", xReference, yReference))
        Next
    Next


    ' create a set that references to the cells of table
    Dim tableReferences As New CellReferencesSet(New CellReferences(columnIndex, rowIndex, columnIndex + size + 1, rowIndex + size + 1))

    ' set columns width to 30 px
    editor.SetColumnsWidth(sheet, tableReferences, 30)
    ' set rows width to 30 px
    editor.SetRowsHeight(sheet, tableReferences, 30)

    ' create the outside thick border and the inside thin border
    Dim thinBorder As New CellBorder(CellBorderStyle.Thin, VintasoftColor.Black)
    Dim thickBorder As New CellBorder(CellBorderStyle.Thick, VintasoftColor.Black)
    Dim outsideThikInsideThin As New CellsBorders(New CellBorders(thickBorder), thinBorder, thinBorder)

    ' create dictionary that contains cell properties (centered text align, the outside thick border, the inside thin border)
    Dim properties As New Dictionary(Of CellStyleProperty, Object)()
    properties.Add(CellStyleProperty.TextVerticalAlign, TextVerticalAlign.Middle)
    properties.Add(CellStyleProperty.TextHorizontalAlign, TextHorizontalAlign.Center)
    properties.Add(CellStyleProperty.Borders, outsideThikInsideThin)
    ' change the style properties for table cells
    editor.ChangeCellsStyleProperties(sheet, tableReferences, properties)


    ' create a set that references the table headers
    Dim tableHeaders As New CellReferencesSet()
    tableHeaders.Add(New CellReferences(columnIndex + 1, rowIndex, columnIndex + size + 1, rowIndex))
    tableHeaders.Add(New CellReferences(columnIndex, rowIndex + 1, columnIndex, rowIndex + size + 1))

    ' set bold font for table headers
    editor.SetFontIsBold(sheet, tableHeaders, True)
    ' set the outside thick border and the inside thin borders for table headers
    editor.SetBorders(sheet, tableHeaders, outsideThikInsideThin)
    ' set the fill color for table headers
    editor.SetFillColor(sheet, tableHeaders, VintasoftColor.FromRgb(0, 255, 128))
End Sub

public static void CreateSpreadsheetAndSaveToXlsxFile(string outXlsxFilename)
{
    // create a spreadsheet editor for synchronous editing of new spreadsheet document
    using (SpreadsheetEditor editor = SpreadsheetEditor.CreateEditor())
    {
        // start the spreadsheet editing
        editor.StartEditing();

        // get the first worksheet (empty)
        Worksheet sheet = editor.Document.Worksheets[0];
        editor.RenameWorksheet(0, "Multiplication table");

        // fill the multiplication table (starts from "B2" cell)
        FillMultiplicationTable(editor, sheet, 1, 1, 1, 20);

        // finish the spreadsheet editing
        editor.FinishEditing();

        // save created spreadsheet as XLSX file
        editor.SaveAs(outXlsxFilename);
    }
}

/// <summary>
/// Fills the multiplication table.
/// </summary>
/// <param name="editor">The spreadsheet editor.</param>
/// <param name="sheet">The sheet.</param>
/// <param name="columnIndex">Index of the column.</param>
/// <param name="rowIndex">Index of the row.</param>
/// <param name="firstNumber">The first number.</param>
/// <param name="lastNumber">The last number.</param>
private static void FillMultiplicationTable(
    SpreadsheetEditor editor,
    Worksheet sheet,
    int columnIndex,
    int rowIndex,
    int firstNumber,
    int lastNumber)
{
    // fill table

    int size = lastNumber - firstNumber;
    for (int x = 0; x <= size; x++)
    {
        CellReference xReference = new CellReference(columnIndex + x + 1, rowIndex);

        editor.SetCellValue(sheet, columnIndex + x + 1, rowIndex, (firstNumber + x).ToString());
        editor.SetCellValue(sheet, columnIndex, rowIndex + x + 1, (firstNumber + x).ToString());
        for (int y = 0; y <= size; y++)
        {
            CellReference yReference = new CellReference(columnIndex, rowIndex + y + 1);
            CellReference currentReference = new CellReference(xReference.ColumnIndex, rowIndex + y + 1);
            editor.SetCellValue(sheet, currentReference, string.Format("={0}*{1}", xReference, yReference));
        }
    }


    // create a set that references to the cells of table
    CellReferencesSet tableReferences = new CellReferencesSet(new CellReferences(columnIndex, rowIndex, columnIndex + size + 1, rowIndex + size + 1));
    
    // set columns width to 30 px
    editor.SetColumnsWidth(sheet, tableReferences, 30);
    // set rows width to 30 px
    editor.SetRowsHeight(sheet, tableReferences, 30);

    // create the outside thick border and the inside thin border
    CellBorder thinBorder = new CellBorder(CellBorderStyle.Thin, VintasoftColor.Black);
    CellBorder thickBorder = new CellBorder(CellBorderStyle.Thick, VintasoftColor.Black);
    CellsBorders outsideThikInsideThin = new CellsBorders(new CellBorders(thickBorder), thinBorder, thinBorder);

    // create dictionary that contains cell properties (centered text align, the outside thick border, the inside thin border)
    Dictionary<CellStyleProperty, object> properties = new Dictionary<CellStyleProperty, object>();
    properties.Add(CellStyleProperty.TextVerticalAlign, TextVerticalAlign.Middle);
    properties.Add(CellStyleProperty.TextHorizontalAlign, TextHorizontalAlign.Center);
    properties.Add(CellStyleProperty.Borders, outsideThikInsideThin);
    // change the style properties for table cells
    editor.ChangeCellsStyleProperties(sheet, tableReferences, properties);


    // create a set that references the table headers
    CellReferencesSet tableHeaders = new CellReferencesSet();
    tableHeaders.Add(new CellReferences(columnIndex + 1, rowIndex, columnIndex + size + 1, rowIndex));
    tableHeaders.Add(new CellReferences(columnIndex, rowIndex + 1, columnIndex, rowIndex + size + 1));

    // set bold font for table headers
    editor.SetFontIsBold(sheet, tableHeaders, true);
    // set the outside thick border and the inside thin borders for table headers
    editor.SetBorders(sheet, tableHeaders, outsideThikInsideThin);
    // set the fill color for table headers
    editor.SetFillColor(sheet, tableHeaders, VintasoftColor.FromRgb(0, 255, 128));
}