This is the 2nd post of a series of posts about NPOI 2.0.

NPOI is jumping from version 1.2.5 directly to 2.0. A big reason for this is that it now supports Office 2007 formats (.xlsx and .docx). Given this fact, using NPOI 2.0 will seem a little bit more complicated than the previous version because NPOI now provides multiple namespaces, including HSSF (Excel 2003), XSSF (Excel 2007) and XWPF (Word 2007).

Don’t freak out! We’re here to help you understand how to work with all those namespaces.

Excel 2007 support
Here’s a simple sample for Excel 2007…

using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System.IO;

namespace NPOI.Examples.XSSF.SetCellValuesInXlsx
{
    class Program
    {
        static void Main(string[] args)
        {
            IWorkbook workbook = new XSSFWorkbook();
            
            ISheet sheet1 = workbook.CreateSheet("Sheet1");

            sheet1.CreateRow(0).CreateCell(0).SetCellValue("This is a Sample");
            
            int x = 1;
            
            for (int i = 1; i <= 15; i++)
            {
                IRow row = sheet1.CreateRow(i);
                
                for (int j = 0; j < 15; j++)
                {
                    row.CreateCell(j).SetCellValue(x++);
                }
            }

            FileStream sw = File.Create("test.xlsx");

            workbook.Write(sw);
            
            sw.Close();
        }
    }
}

To go deeper and explore all the features available for Excel 2007 you can check a handful of sample projects here (as of now 24 sample projects showcasing many available features):

https://github.com/tonyqus/npoi/tree/master/examples/xssf

Open the file NPOI.XSSF.Examples.2010.sln to have all them show up in Visual Studio’s Solution Explorer.

 Figure 1 - Excel 2007 (NPOI.XSSF) sample projects list

Word 2007 support
Here’s a simple document example for Word 2007…

using NPOI.XWPF.UserModel;
using System.IO;

namespace SimpleDocument
{
    class Program
    {
        static void Main(string[] args)
        {
            XWPFDocument doc = new XWPFDocument();

            XWPFParagraph p1 = doc.CreateParagraph();
            p1.SetAlignment(ParagraphAlignment.CENTER);
            p1.SetBorderBottom(Borders.DOUBLE);
            p1.SetBorderTop(Borders.DOUBLE);

            p1.SetBorderRight(Borders.DOUBLE);
            p1.SetBorderLeft(Borders.DOUBLE);
            p1.SetBorderBetween(Borders.SINGLE);

            p1.SetVerticalAlignment(TextAlignment.TOP);

            XWPFRun r1 = p1.CreateRun();
            r1.SetBold(true);
            r1.SetText("The quick brown fox");
            r1.SetBold(true);
            r1.SetFontFamily("Courier");
            r1.SetUnderline(UnderlinePatterns.DotDotDash);
            r1.SetTextPosition(100);

            XWPFParagraph p2 = doc.CreateParagraph();
            p2.SetAlignment(ParagraphAlignment.RIGHT);

            //BORDERS
            p2.SetBorderBottom(Borders.DOUBLE);
            p2.SetBorderTop(Borders.DOUBLE);
            p2.SetBorderRight(Borders.DOUBLE);
            p2.SetBorderLeft(Borders.DOUBLE);
            p2.SetBorderBetween(Borders.SINGLE);

            XWPFRun r2 = p2.CreateRun();
            r2.SetText("jumped over the lazy dog");
            r2.SetStrike(true);
            r2.SetFontSize(20);

            XWPFRun r3 = p2.CreateRun();
            r3.SetText("and went away");
            r3.SetStrike(true);
            r3.SetFontSize(20);
            r3.SetSubscript(VerticalAlign.SUPERSCRIPT);


            XWPFParagraph p3 = doc.CreateParagraph();
            p3.SetWordWrap(true);
            p3.SetPageBreak(true);

            //p3.SetAlignment(ParagraphAlignment.DISTRIBUTE);
            p3.SetAlignment(ParagraphAlignment.BOTH);
            p3.SetSpacingLineRule(LineSpacingRule.EXACT);

            p3.SetSetIndentationFirstLine(600);


            XWPFRun r4 = p3.CreateRun();
            r4.SetTextPosition(20);
            r4.SetText("To be, or not to be: that is the question: "
                    + "Whether 'tis nobler in the mind to suffer "
                    + "The slings and arrows of outrageous fortune, "
                    + "Or to take arms against a sea of troubles, "
                    + "And by opposing end them? To die: to sleep; ");
            r4.AddBreak(BreakType.PAGE);
            r4.SetText("No more; and by a sleep to say we end "
                    + "The heart-ache and the thousand natural shocks "
                    + "That flesh is heir to, 'tis a consummation "
                    + "Devoutly to be wish'd. To die, to sleep; "
                    + "To sleep: perchance to dream: ay, there's the rub; "
                    + ".......");
            r4.SetItalic(true);
            //This would imply that this break shall be treated as a simple line break, and break the line after that word:

            XWPFRun r5 = p3.CreateRun();
            r5.SetTextPosition(-10);
            r5.SetText("For in that sleep of death what dreams may come");
            r5.AddCarriageReturn();
            r5.SetText("When we have shuffled off this mortal coil,"
                    + "Must give us pause: there's the respect"
                    + "That makes calamity of so long life;");
            r5.AddBreak();
            r5.SetText("For who would bear the whips and scorns of time,"
                    + "The oppressor's wrong, the proud man's contumely,");

            r5.AddBreak(BreakClear.ALL);
            r5.SetText("The pangs of despised love, the law's delay,"
                    + "The insolence of office and the spurns" + ".......");

            FileStream out1 = new FileStream("simple.docx", FileMode.Create);
            doc.Write(out1);
            out1.Close();
        }
    }
}

To go deeper an explore all features available for Word 2007 you can check a handful of sample projects here (as of now 5 sample projects showcasing some available features):

https://github.com/tonyqus/npoi/tree/master/examples/xwpf

Open the file NPOI.XWPF.Examples.2010.sln to have all them show up in Visual Studio’s Solution Explorer.

Figure 2 - Word 2007 (NPOI.XWPF) sample projects list