Open and Modify a Document

On this page we will look at how to open an existing document and add text into it using Aspose.Words or Open XML SDK.

Aspose.Words

In Aspose.Words, we normally use the Document class to create a document and the DocumentBuilder class to modify it.

The following code example shows how to open an existing document and add text into it:

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET.git.
Document doc = new Document(MyDir + "Document.docx");
DocumentBuilder builder = new DocumentBuilder(doc);

builder.MoveToDocumentEnd();
builder.Writeln();
builder.Write("This is the text added to the end of the document.");

doc.Save(ArtifactsDir + "Add text - Aspose.Words.docx");

Open XML SDK

You can also do the same using the Open XML SDK. At the same time, note that it looks somewhat more complicated and more cumbersome.

Below is the code explaining this functionality:

// For complete examples and data files, please go to https://github.com/aspose-words/Aspose.Words-for-.NET.git.
File.Copy(MyDir + "Document.docx", ArtifactsDir + "Add text - OpenXML.docx", true);

using WordprocessingDocument doc = WordprocessingDocument.Open(ArtifactsDir + "Add text - OpenXML.docx", true);

MainDocumentPart mainPart = doc.MainDocumentPart;
Body body = doc.MainDocumentPart.Document.Body;

// Create a new paragraph with the text you want to add
Paragraph newParagraph = new Paragraph();
Run newRun = new Run();
Text newText = new Text("This is the text added to the end of the document.");
newRun.Append(newText);
newParagraph.Append(newRun);

// Append the new paragraph to the body
body.Append(newParagraph);

// Save the changes
mainPart.Document.Save();

You can download the sample file of this example from Aspose.Words GitHub.