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

        ' get the first worksheet (empty)
        Dim sheet As Vintasoft.Imaging.Office.Spreadsheet.Document.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 Vintasoft.Imaging.Office.Spreadsheet.SpreadsheetEditor, sheet As Vintasoft.Imaging.Office.Spreadsheet.Document.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 Vintasoft.Imaging.Office.Spreadsheet.Document.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 Vintasoft.Imaging.Office.Spreadsheet.Document.CellReference(columnIndex, rowIndex + y + 1)
            Dim currentReference As New Vintasoft.Imaging.Office.Spreadsheet.Document.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 Vintasoft.Imaging.Office.Spreadsheet.Document.CellReferencesSet(New Vintasoft.Imaging.Office.Spreadsheet.Document.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 Vintasoft.Imaging.Office.Spreadsheet.Document.CellBorder(Vintasoft.Imaging.Office.Spreadsheet.Document.CellBorderStyle.Thin, Vintasoft.Primitives.VintasoftColor.Black)
    Dim thickBorder As New Vintasoft.Imaging.Office.Spreadsheet.Document.CellBorder(Vintasoft.Imaging.Office.Spreadsheet.Document.CellBorderStyle.Thick, Vintasoft.Primitives.VintasoftColor.Black)
    Dim outsideThikInsideThin As New Vintasoft.Imaging.Office.Spreadsheet.Document.CellsBorders(New Vintasoft.Imaging.Office.Spreadsheet.Document.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 System.Collections.Generic.Dictionary(Of Vintasoft.Imaging.Office.Spreadsheet.CellStyleProperty, Object)()
    properties.Add(Vintasoft.Imaging.Office.Spreadsheet.CellStyleProperty.TextVerticalAlign, Vintasoft.Imaging.Office.Spreadsheet.Document.TextVerticalAlign.Middle)
    properties.Add(Vintasoft.Imaging.Office.Spreadsheet.CellStyleProperty.TextHorizontalAlign, Vintasoft.Imaging.Office.Spreadsheet.Document.TextHorizontalAlign.Center)
    properties.Add(Vintasoft.Imaging.Office.Spreadsheet.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 Vintasoft.Imaging.Office.Spreadsheet.Document.CellReferencesSet()
    tableHeaders.Add(New Vintasoft.Imaging.Office.Spreadsheet.Document.CellReferences(columnIndex + 1, rowIndex, columnIndex + size + 1, rowIndex))
    tableHeaders.Add(New Vintasoft.Imaging.Office.Spreadsheet.Document.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, Vintasoft.Primitives.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 (Vintasoft.Imaging.Office.Spreadsheet.SpreadsheetEditor editor = Vintasoft.Imaging.Office.Spreadsheet.SpreadsheetEditor.CreateEditor())
    {
        // start the spreadsheet editing
        editor.StartEditing();

        // get the first worksheet (empty)
        Vintasoft.Imaging.Office.Spreadsheet.Document.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(
    Vintasoft.Imaging.Office.Spreadsheet.SpreadsheetEditor editor,
    Vintasoft.Imaging.Office.Spreadsheet.Document.Worksheet sheet,
    int columnIndex,
    int rowIndex,
    int firstNumber,
    int lastNumber)
{
    // fill table

    int size = lastNumber - firstNumber;
    for (int x = 0; x <= size; x++)
    {
        Vintasoft.Imaging.Office.Spreadsheet.Document.CellReference xReference = new Vintasoft.Imaging.Office.Spreadsheet.Document.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++)
        {
            Vintasoft.Imaging.Office.Spreadsheet.Document.CellReference yReference = new Vintasoft.Imaging.Office.Spreadsheet.Document.CellReference(columnIndex, rowIndex + y + 1);
            Vintasoft.Imaging.Office.Spreadsheet.Document.CellReference currentReference = new Vintasoft.Imaging.Office.Spreadsheet.Document.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
    Vintasoft.Imaging.Office.Spreadsheet.Document.CellReferencesSet tableReferences = new Vintasoft.Imaging.Office.Spreadsheet.Document.CellReferencesSet(new Vintasoft.Imaging.Office.Spreadsheet.Document.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
    Vintasoft.Imaging.Office.Spreadsheet.Document.CellBorder thinBorder = new Vintasoft.Imaging.Office.Spreadsheet.Document.CellBorder(Vintasoft.Imaging.Office.Spreadsheet.Document.CellBorderStyle.Thin, Vintasoft.Primitives.VintasoftColor.Black);
    Vintasoft.Imaging.Office.Spreadsheet.Document.CellBorder thickBorder = new Vintasoft.Imaging.Office.Spreadsheet.Document.CellBorder(Vintasoft.Imaging.Office.Spreadsheet.Document.CellBorderStyle.Thick, Vintasoft.Primitives.VintasoftColor.Black);
    Vintasoft.Imaging.Office.Spreadsheet.Document.CellsBorders outsideThikInsideThin = new Vintasoft.Imaging.Office.Spreadsheet.Document.CellsBorders(new Vintasoft.Imaging.Office.Spreadsheet.Document.CellBorders(thickBorder), thinBorder, thinBorder);

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


    // create a set that references the table headers
    Vintasoft.Imaging.Office.Spreadsheet.Document.CellReferencesSet tableHeaders = new Vintasoft.Imaging.Office.Spreadsheet.Document.CellReferencesSet();
    tableHeaders.Add(new Vintasoft.Imaging.Office.Spreadsheet.Document.CellReferences(columnIndex + 1, rowIndex, columnIndex + size + 1, rowIndex));
    tableHeaders.Add(new Vintasoft.Imaging.Office.Spreadsheet.Document.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, Vintasoft.Primitives.VintasoftColor.FromRgb(0, 255, 128));
}