//https://msdn.microsoft.com/en-us/library/microsoft.office.tools.word.document.selectionchange.aspx public static void ThisDocument_SelectionChange(object sender, Microsoft.Office.Tools.Word.SelectionEventArgs e) { Globals.ThisAddIn._userControlTaskPane.richTextBox1.Text = e.Selection.Text; Methods _methods = new Methods(); _methods.IsBookmark(); }