Edit word document and update

Hi Ajay,

You can use Spire.Doc to edit Word document as well as convert it to PDF.

https://www.e-iceblue.com/Introduce/word-for-net-introduce.html

Code example for creating a Word document:

https://www.e-iceblue.com/Tutorials/Spire.Doc/Spire.Doc-Program-Guide/Create-Write-and-Save-Word-in-C-and-VB.NET.html

using Spire.Doc;
using Spire.Doc.Documents;
using System.Drawing;

namespace CreateWordDocument
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Document object
            Document doc = new Document();

            //Add a section
            Section section = doc.AddSection();

            //Set the page margins
            section.PageSetup.Margins.All = 40f;

            //Add a paragraph as title
            Paragraph titleParagraph = section.AddParagraph();
            titleParagraph.AppendText("Introduction of Spire.Doc for .NET");

            //Add two paragraphs as body
            Paragraph bodyParagraph_1 = section.AddParagraph();
            bodyParagraph_1.AppendText("Spire.Doc for .NET is a professional Word.NET library specifically designed " +
                "for developers to create, read, write, convert, compare and print Word documents on any.NET platform " +
                "(.NET Framework, .NET Core, .NET Standard, Xamarin & Mono Android) with fast and high-quality performance.");


            Paragraph bodyParagraph_2 = section.AddParagraph();
            bodyParagraph_2.AppendText("As an independent Word .NET API, Spire.Doc for .NET doesn't need Microsoft Word to " +
                         "be installed on neither the development nor target systems. However, it can incorporate Microsoft Word " +
                         "document creation capabilities into any developers' .NET applications.");

            //Create a style for title paragraph
            ParagraphStyle style1 = new ParagraphStyle(doc);
            style1.Name = "titleStyle";
            style1.CharacterFormat.Bold = true;
            style1.CharacterFormat.TextColor = Color.Purple;
            style1.CharacterFormat.FontName = "Times New Roman";
            style1.CharacterFormat.FontSize = 12;
            doc.Styles.Add(style1);
            titleParagraph.ApplyStyle("titleStyle");

            //Create a style for body paragraphs
            ParagraphStyle style2 = new ParagraphStyle(doc);
            style2.Name = "paraStyle";
            style2.CharacterFormat.FontName = "Times New Roman";
            style2.CharacterFormat.FontSize = 12;
            doc.Styles.Add(style2);
            bodyParagraph_1.ApplyStyle("paraStyle");
            bodyParagraph_2.ApplyStyle("paraStyle");

            //Set the horizontal alignment of paragraphs
            titleParagraph.Format.HorizontalAlignment = HorizontalAlignment.Center;
            bodyParagraph_1.Format.HorizontalAlignment = HorizontalAlignment.Justify;
            bodyParagraph_2.Format.HorizontalAlignment = HorizontalAlignment.Justify;

            //Set the first line indent 
            bodyParagraph_1.Format.FirstLineIndent = 30;
            bodyParagraph_2.Format.FirstLineIndent = 30;

            //Set the after spacing
            titleParagraph.Format.AfterSpacing = 10;
            bodyParagraph_1.Format.AfterSpacing = 10;

            //Save to file
            doc.SaveToFile("WordDocument.docx", FileFormat.Docx2013);
        }
    }
}

Code example for converting a Word document to PDF:

https://www.e-iceblue.com/Tutorials/Spire.Doc/Spire.Doc-Program-Guide/How-to-Convert-Word-to-PDF.html

using Spire.Doc;

namespace ToPDF
{
    class Program
    {
        static void Main(string[] args)
        {
            //Create a Document object
            Document document = new Document();

            //Load a sample Word document
            document.LoadFromFile(@"C:\Users\Administrator\Desktop\Test.docx");

            //Save the document to PDF
            document.SaveToFile("ToPDF.pdf", FileFormat.PDF);
        }
    }
}

Hi Ajay,

Use  DocumentFormat.OpenXml

To edit word document

using (WordprocessingDocument doc = WordprocessingDocument.Create
("C:\\Users\\Administrator\\Desktop\\Test\\WordTest.docx", DocumentFormat.OpenXml.WordprocessingDocumentType.Document))
       {
           // Add a main document part.
           MainDocumentPart mainPart = doc.AddMainDocumentPart();

           // Create the document structure and add some text.
           mainPart.Document = new Document();
           Body body = mainPart.Document.AppendChild(new Body());
           Paragraph para = body.AppendChild(new Paragraph());
           Run run = para.AppendChild(new Run());

           // String msg contains the text, "Hello, Word!"
           run.AppendChild(new Text("New text in document"));
       }

To Save word file to pdf use Microsoft.Office.Interop.Word

protected void SaveAsPDF_Click(object sender, EventArgs e)
        {
            Microsoft.Office.Interop.Word.Application application = new Microsoft.Office.Interop.Word.Application();
            Document document = null;
            application.Visible = false;
            // open docx file
            document = application.Documents.Open("C:\\Users\\Administrator\\Desktop\\Test\\WordTest.docx");
            // convert to pdf file
            document.ExportAsFixedFormat("C:\\Users\\Administrator\\Desktop\\Test\\WordTest.pdf", WdExportFormat.wdExportFormatPDF);
            document.Close();
        }

Over here i have shared example from the code which i have in my windows form application.

using Word = Microsoft.Office.Interop.Word;

private void btnEditDocument_Click(object sender, EventArgs e)
{
    Word.Application wordApp = new Word.Application();
    Word.Document doc = wordApp.Documents.Open(@"C:\Path\To\Document.docx");
    Word.Range range = doc.Content;
    range.Text = "Hello, World!";
    doc.Save();
    doc.Close();
    wordApp.Quit();
}