public void DefineInvoice(Document document)
        {
            Section section = document.AddSection();
            // create the text frame for address
            TextFrame addressFrame = section.AddTextFrame();
            addressFrame.Height = "3.0cm";
            addressFrame.Width = "7.0cm";
            addressFrame.Left = ShapePosition.Left;
            addressFrame.RelativeHorizontal = RelativeHorizontal.Margin;
            addressFrame.Top = "5.0cm";
            addressFrame.RelativeVertical = RelativeVertical.Page;

            //fill in address for text frame
            Paragraph paragraph = addressFrame.AddParagraph();
            paragraph.AddText("Nieto LLC");
            paragraph.AddLineBreak();
            paragraph.AddText("6110 Google Drive");
            paragraph.AddLineBreak();
            paragraph.AddText("Houston, TX 77309");
            paragraph.AddLineBreak();
            paragraph.AddText("P: 281-890-5899");

            //define table
            Table table = section.AddTable();
           
           
 
            table.Borders.Width = 0.75;
           

            Column column = table.AddColumn(Unit.FromCentimeter(7));
            column.Format.Alignment = ParagraphAlignment.Center;

            column = table.AddColumn(Unit.FromCentimeter(2));
            column.Format.Alignment = ParagraphAlignment.Center;

            column = table.AddColumn(Unit.FromCentimeter(2));
            column.Format.Alignment = ParagraphAlignment.Center;

            column = table.AddColumn(Unit.FromCentimeter(2));
            column.Format.Alignment = ParagraphAlignment.Center;

            column = table.AddColumn(Unit.FromCentimeter(2));
            column.Format.Alignment = ParagraphAlignment.Center;
           

            //define header of table
            Row row = table.AddRow();
            row.HeadingFormat = true;
            Cell cell = row.Cells[0];
            cell.AddParagraph("Item List");
            cell.Format.Font.Bold = true;

            cell = row.Cells[1];
            cell.AddParagraph("Quantity");
            cell.Format.Font.Bold = true;

            cell = row.Cells[2];
            cell.AddParagraph("Unit Price");
            cell.Format.Font.Bold = true;

            cell = row.Cells[3];
            cell.AddParagraph("Tax");
            cell.Format.Font.Bold = true;

            cell = row.Cells[4];
            cell.AddParagraph("Total Price");
            cell.Format.Font.Bold = true;

            //define one row of invoice information
            row = table.AddRow();
            cell = row.Cells[0];
            cell.AddParagraph("Admin theme with psd project layouts");
            cell = row.Cells[1];
            cell.AddParagraph("1");
            cell = row.Cells[2];
            cell.AddParagraph("$26.00");
            cell = row.Cells[3];
            cell.AddParagraph("$5.98");
            cell = row.Cells[4];
            cell.AddParagraph("$31.98");

            //define another row of invoice information
            row = table.AddRow();
            cell = row.Cells[0];
            cell.AddParagraph("Wordpress Theme customization");
            cell = row.Cells[1];
            cell.AddParagraph("2");
            cell = row.Cells[2];
            cell.AddParagraph("$80.00");
            cell = row.Cells[3];
            cell.AddParagraph("$36.80");
            cell = row.Cells[4];
            cell.AddParagraph("$196.80");

            //define another row of invoice information
            row = table.AddRow();
            cell = row.Cells[0];
            cell.AddParagraph("Angular 9 and Node JS Application");
            cell = row.Cells[1];
            cell.AddParagraph("3");
            cell = row.Cells[2];
            cell.AddParagraph("$420.00");
            cell = row.Cells[3];
            cell.AddParagraph("$193.20");
            cell = row.Cells[4];
            cell.AddParagraph("$1033.20");

            //add invisible row as a space line to the table
            row = table.AddRow();
            row.Borders.Visible = false;

            //add the subtotal row
            row = table.AddRow();
            row.Cells[0].Borders.Visible = false;
            row.Cells[0].AddParagraph("Sub Total:");
            row.Cells[0].Format.Font.Bold = true;
            row.Cells[0].Format.Alignment = ParagraphAlignment.Right;
            row.Cells[0].MergeRight = 3;

            //add tax row
            row = table.AddRow();
            row.Cells[0].Borders.Visible = false;
            row.Cells[0].AddParagraph("TAX:");
            row.Cells[0].Format.Font.Bold = true;
            row.Cells[0].Format.Alignment = ParagraphAlignment.Right;
            row.Cells[0].MergeRight = 3;

            //add total
            row = table.AddRow();
            row.Cells[0].Borders.Visible = false;
            row.Cells[0].AddParagraph("TOTAL:");
            row.Cells[0].Format.Font.Bold = true;
            row.Cells[0].Format.Alignment = ParagraphAlignment.Right;
            row.Cells[0].MergeRight = 3;

           

        }