public static void HighlightText()
{
WordFile wordFile = new WordFile();
WordDocument document = wordFile.Import(File.ReadAllBytes("Sample.docx"));
WordDocumentBuilder builder = new WordDocumentBuilder(document);
//Apply new highlight style
Action <CharacterState> action = new Action <CharacterState>((state) =>
{
state.HighlightColor = Colors.Yellow;
});
//Highlight all the "Page" text in the document
builder.ReplaceStyling("Page", true, true, action);
File.WriteAllBytes("HighlightText.docx", wordFile.Export(document));
}