CellRange usedCellRange = worksheet.UsedCellRange;

            for (int row = 0; row < usedCellRange.RowCount; row++)
            {
                for (int column = 0; column < usedCellRange.ColumnCount; column++)
                {
                    ICellValue cellValue = worksheet.Cells[row, column].GetValue().Value;
                    if (cellValue.ValueType == CellValueType.Formula)
                    {
                        worksheet.Cells[row, column].SetValue(cellValue);
                    }
                }
            }

WorksheetPageSetup pageSetup = worksheet.WorksheetPageSetup;
Size pageSize = new Size(50, 80)
pageSetup.PageSize = pageSize; // produces cs0200
pageSetup.PageSize.Width = pageSize.Width; // produces cs1612
pageSetup.PageSize.Height = pageSize.Height; // produces cs1612

var usedCellRange = workbook.ActiveWorksheet.GetUsedCellRange(
    CellPropertyDefinitions.AllPropertyDefinitions
    .Except(
        CellPropertyDefinitions.AllPropertyDefinitions.Where(p => p.Name == "DataValidationRule" || p.Name == "ConditionalFormatting")));

            Workbook workbook = new Workbook();
            Worksheet worksheet = workbook.Worksheets.Add();

            List<string> categories = new List<string> { "New", "In Progress", "Ready for Test", "Done", "Declined" };
            worksheet.Cells[0, 0].SetValue("New");
            worksheet.Cells[0, 1].SetValue(1);
            worksheet.Cells[0, 2].SetValue(2.5);
            worksheet.Cells[1, 0].SetValue("In Progress");
            worksheet.Cells[1, 1].SetValue(2.8);
            worksheet.Cells[1, 2].SetValue(0);
            worksheet.Cells[2, 0].SetValue("Ready for Test");
            worksheet.Cells[2, 1].SetValue(2);
            worksheet.Cells[2, 2].SetValue(1);
            worksheet.Cells[3, 0].SetValue("Done");
            worksheet.Cells[3, 1].SetValue(1.4);
            worksheet.Cells[3, 2].SetValue(0);
            worksheet.Cells[4, 0].SetValue("Declined");
            worksheet.Cells[4, 1].SetValue(3);
            worksheet.Cells[4, 2].SetValue(0);

            

            FloatingChartShape chartShape = new FloatingChartShape(worksheet, new CellIndex(5, 5), new CellRange(0, 0, 4, 2),ChartType.Column)
            {
                Width = 400,
                Height = 250
            };

            worksheet.Charts.Add(chartShape);

            CellSelection cellSelection = worksheet.Cells[new CellIndex(0, 1), new CellIndex(4, 2)];
            CellValueFormat specialFormat = new CellValueFormat("0");
            cellSelection.SetFormat(specialFormat);

            string outputFilePath = "SampleFile.xlsx";

            Telerik.Windows.Documents.Spreadsheet.FormatProviders.IWorkbookFormatProvider formatProvider = new Telerik.Windows.Documents.Spreadsheet.FormatProviders.OpenXml.Xlsx.XlsxFormatProvider();

            using (Stream output = new FileStream(outputFilePath, FileMode.Create))
            {
                formatProvider.Export(workbook, output);
            }
            Process.Start(new ProcessStartInfo() { FileName = outputFilePath, UseShellExecute = true });