private void button1_Click(object sender, EventArgs e) { //Create word document Document document = new Document(); //load a document document.LoadFromFile(@"..\..\..\..\..\..\Data\FindAndReplace.doc"); //Find text TextSelection[] textSelections = document.FindAllString(this.textBox1.Text, true, true); //Set hightlight foreach(TextSelection selection in textSelections) { selection.GetAsOneRange().CharacterFormat.HighlightColor = Color.Yellow; } //Save doc file. document.SaveToFile("Sample.doc", FileFormat.Doc); //Launching the MS Word file. WordDocViewer("Sample.doc"); }