using IronWord;

// Open existing Word
WordDocument doc = new WordDocument("sample.docx");

// Edit existing text
doc.Paragraphs[0].ReplaceText("old text.", "This is the edited text.");

      // Edit text by retrieving the old text
      doc.Paragraphs[1].ReplaceText(doc.Paragraphs[1].Texts[1].Text, "Updated content for the second paragraph.");

      // Export docx
      doc.SaveAs("document.docx");

Imports IronWord

' Open existing Word
Private doc As New WordDocument("sample.docx")

' Edit existing text
doc.Paragraphs(0).ReplaceText("old text.", "This is the edited text.")

	  ' Edit text by retrieving the old text
	  doc.Paragraphs(1).ReplaceText(doc.Paragraphs(1).Texts(1).Text, "Updated content for the second paragraph.")

	  ' Export docx
	  doc.SaveAs("document.docx")