let myString : string = 'this is a string';
myString = 42; // error!

function ReturnNumber() : number {
   return 42;
}
let anotherString : string = 'this is also a string';
anotherString = ReturnNumber(); // error!

 new PdfReport().DocumentPreferences(doc =>
            {
                doc.RunDirection(PdfRunDirection.RightToLeft);
                doc.Orientation(PageOrientation.Portrait);
                doc.PageSize(PdfPageSize.A4);
                doc.DocumentMetadata(new DocumentMetadata { Author = _company, Application = "نرم افزار ", Keywords = "سود فاکتورها", Subject = "سود فاکتورها", Title = "سود فاکتورها" });
            })
           .DefaultFonts(fonts =>
           {
               fonts.Path(Path.Combine(Environment.CurrentDirectory, @"fonts\irsans.ttf"),
                           Path.Combine(Environment.CurrentDirectory, @"fonts\verdana.ttf"));
               fonts.Size(8);
           })
           .PagesFooter(footer =>
           {
            footer.DefaultFooter(DateTimeHelper.ToPersianShortDateString(DateTime.Now,true,true));
           })
           .PagesHeader(header =>
           {
               header.HtmlHeader(rptHeader =>
               {
                   // Register fonts and styles
                   var styleSheet = new iTextSharp.text.html.simpleparser.StyleSheet();

                   iTextSharp.text.FontFactory.Register(Path.Combine(Environment.CurrentDirectory, @"fonts\BFARNAZ.TTF"), "Farnaz");
                   styleSheet.LoadStyle("report-header", "size", "12pt");
                   styleSheet.LoadStyle("report-header", "font-family", "Farnaz");

                   iTextSharp.text.FontFactory.Register(Path.Combine(Environment.CurrentDirectory, @"fonts\BNAZANIN.TTF"), "Bnazanin");
                   styleSheet.LoadStyle("report-desc", "size", "12pt");
                   styleSheet.LoadStyle("report-desc", "font-family", "Bnazanin");

                   rptHeader.PageHeaderProperties(new HeaderBasicProperties
                   {
                       RunDirection = PdfRunDirection.RightToLeft,
                       HorizontalAlignment = PdfRpt.Core.Contracts.HorizontalAlignment.Center,
                       ShowBorder = false,
                       PdfFont = header.PdfFont,
                       StyleSheet = styleSheet
                   });

                   rptHeader.AddPageHeader(pageHeader =>
                   {
                       var title = "سود فاکتورها";
                       var companyName = string.Concat("شرکت / فروشگاه ", _company);
                       var financialYear = string.Concat("سال مالی ", _financialPeriod.GetCurrentFinancialPeriodTitle());
                       return string.Format(@"    
                                                    <table cellpadding='0' cellspacing='0' class='report-header'>
                                                        <tr>
                                                            <td>{0}</td>
                                                        </tr>
                                                        <tr>
                                                            <td>{1}</td>
                                                        </tr> 
                                                        <tr>
                                                            <td>{2}</td>
                                                        </tr>
                                                   </table>
                                                    <table cellpadding='0' cellspacing='0' class='report-desc'> 
                                                        <tr>
                                                            <td align='left' width='10%'>{3}</td><td align='left' width='10%'>از تاریخ:</td>
                                                            <td align='left' width='65%'>{4}</td><td align='left' width='15%'>از شماره:</td> 
                                                        </tr>
                                                        <tr>
                                                           <td align='left' width='10%'>{5}</td> <td align='left' width='10%'>تا تاریخ:</td> 
                                                            <td align='left' width='65%'>{6}</td> <td align='left' width='15%'>تا شماره:</td> 
                                                        </tr>
                                                    </table>
                                             "
                                                          , title, companyName,
                                                         financialYear,
                                                         DateTimeHelper.ToPersianShortDateString(_fromDate),
                                                         _fromNumber,
                                                         DateTimeHelper.ToPersianShortDateString(_toDate),
                                                         _toNumber
                                                         );
                   });
               });
           })
           .MainTableTemplate(template =>
           {
               template.CustomTemplate(new GrayTemplate());
           })
           .MainTablePreferences(table =>
           {
               table.ColumnsWidthsType(TableColumnWidthType.Relative);
               table.NumberOfDataRowsPerPage(0);
           })
           .MainTableDataSource(dataSource =>
           {
               var factorsProfitItems = FactorsProfitItems.Select(g => new
               {
                   Number = g.Number,
                   SaleDate = g.SaleDate,
                   Customer = g.Customer,
                   Description = g.Description,
                   FactorProfit = g.FactorProfit,
                   Discount = g.Discount,
                   RealProfit = g.RealProfit
               });
               dataSource.StronglyTypedList(factorsProfitItems);
           })
           .MainTableColumns(columns =>
           {
               columns.AddColumn(column =>
               {
                   column.PropertyName<FactorsProfitItemPrintViewModel>(x => x.Number);
                   column.CellsHorizontalAlignment(PdfRpt.Core.Contracts.HorizontalAlignment.Center);
                   column.IsVisible(true);
                   column.Order(0);
                   column.Width(1);
                   column.HeaderCell("ش فاکتور");
               });
               columns.AddColumn(column =>
               {
                   column.PropertyName<FactorsProfitItemPrintViewModel>(x => x.SaleDate);
                   column.CellsHorizontalAlignment(PdfRpt.Core.Contracts.HorizontalAlignment.Left);
                   column.IsVisible(true);
                   column.Order(1);
                   column.Width(1);
                   column.ColumnItemsTemplate(template =>
                   {
                       template.TextBlock();
                       template.DisplayFormatFormula(obj => DateTimeHelper.ToPersianShortDateString((DateTime)obj));
                   });
                   column.HeaderCell("تاریخ");
               });
               columns.AddColumn(column =>
               {
                   column.PropertyName<FactorsProfitItemPrintViewModel>(x => x.Customer);
                   column.CellsHorizontalAlignment(PdfRpt.Core.Contracts.HorizontalAlignment.Left);
                   column.IsVisible(true);
                   column.Order(2);
                   column.Width(1.5f);
                   column.HeaderCell("مشتری");
               });
               columns.AddColumn(column =>
               {
                   column.PropertyName<FactorsProfitItemPrintViewModel>(x => x.Description);
                   column.CellsHorizontalAlignment(PdfRpt.Core.Contracts.HorizontalAlignment.Center);
                   column.IsVisible(true);
                   column.Order(3);
                   column.Width(2);
                   column.HeaderCell("شرح");
               });
               columns.AddColumn(column =>
               {
                   column.PropertyName<FactorsProfitItemPrintViewModel>(x => x.FactorProfit);
                   column.CellsHorizontalAlignment(PdfRpt.Core.Contracts.HorizontalAlignment.Right);
                   column.IsVisible(true);
                   column.Order(4);
                   column.Width(1);
                   column.ColumnItemsTemplate(template =>
                   {
                       template.TextBlock();
                       template.DisplayFormatFormula(obj => string.Format("{0:n0}", obj));
                   });
                   column.AggregateFunction(aggregateFunction =>
                   {
                       aggregateFunction.NumericAggregateFunction(AggregateFunction.Sum);
                       aggregateFunction.DisplayFormatFormula(obj => obj == null ? string.Empty : string.Format("{0:n0}", obj));
                   });
                   column.HeaderCell("سود فاکتور");
               });
               columns.AddColumn(column =>
               {
                   column.PropertyName<FactorsProfitItemPrintViewModel>(x => x.Discount);
                   column.CellsHorizontalAlignment(PdfRpt.Core.Contracts.HorizontalAlignment.Right);
                   column.IsVisible(true);
                   column.Order(5);
                   column.Width(1);
                   column.ColumnItemsTemplate(template =>
                   {
                       template.TextBlock();
                       template.DisplayFormatFormula(obj => string.Format("{0:n0}", obj));
                   });
                   column.AggregateFunction(aggregateFunction =>
                   {
                       aggregateFunction.NumericAggregateFunction(AggregateFunction.Sum);
                       aggregateFunction.DisplayFormatFormula(obj => obj == null ? string.Empty : string.Format("{0:n0}", obj));
                   });
                   column.HeaderCell("تخفیف");
               });
               columns.AddColumn(column =>
               {
                   column.PropertyName<FactorsProfitItemPrintViewModel>(x => x.RealProfit);
                   column.CellsHorizontalAlignment(PdfRpt.Core.Contracts.HorizontalAlignment.Right);
                   column.IsVisible(true);
                   column.Order(6);
                   column.Width(1);
                   column.ColumnItemsTemplate(template =>
                   {
                       template.TextBlock();
                       template.DisplayFormatFormula(obj => string.Format("{0:n0}", obj));
                   });
                   column.AggregateFunction(aggregateFunction =>
                   {
                       aggregateFunction.NumericAggregateFunction(AggregateFunction.Sum);
                       aggregateFunction.DisplayFormatFormula(obj => obj == null ? string.Empty : string.Format("{0:n0}", obj));
                   });
                   column.HeaderCell("سود خالص");
               });
           })
            .MainTableSummarySettings(summarySettings =>
            {
                summarySettings.OverallSummarySettings("جمع کل");
                summarySettings.PreviousPageSummarySettings("نقل از صفحه قبل");
                summarySettings.PageSummarySettings("جمع کل صفحه");
            })
           .MainTableEvents(events =>
           {
               events.DataSourceIsEmpty(message: "داده ای جهت نمایش وجود ندارد.");
               events.CellCreated(args =>
               {
                   args.Cell.BasicProperties.CellPadding = 4f;
               });
               events.MainTableAdded(args =>
               {
                   var taxTable = new PdfGrid(3);  // Create a clone of the MainTable's structure  
                   taxTable.RunDirection = 3;
                   taxTable.SetWidths(new float[] { 3, 3, 3 });
                   taxTable.WidthPercentage = 100f;
                   taxTable.SpacingBefore = 60f;

                   taxTable.AddSimpleRow(
                       (data, cellProperties) =>
                       {
                           data.Value = "امضاء تنظیم کننده";
                           cellProperties.ShowBorder = false;
                           cellProperties.PdfFont = args.PdfFont;
                       },
                       (data, cellProperties) =>
                       {
                           data.Value = "امضاء حسابدار";
                           cellProperties.ShowBorder = false;
                           cellProperties.PdfFont = args.PdfFont;
                       },
                       (data, cellProperties) =>
                       {
                           data.Value = "امضاء مدیرعامل";
                           cellProperties.ShowBorder = false;
                           cellProperties.PdfFont = args.PdfFont;
                       });
                   args.PdfDoc.Add(taxTable);
               });
           })
           .Export(export =>
           {
               export.ToExcel("خروجی اکسل");
               export.ToCsv("خروجی CSV");
               export.ToXml("خروجی XML");
           })
           .Generate(data => data.AsPdfFile(_documentSource));

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<PasswordHasherOptions>(options => options.IterationCount = 100_000);