private void AddHyperlink( string file )
    {
      using( var document = DocX.Load( file ) )
      {
        // Add a hyperlink to the document's Hyperlink collection
        Hyperlink link = document.AddHyperlink( "website", new Uri( "https://xceed.com" ) );

        // Add a paragraph that uses the hyperlink
        document.InsertParagraph( "Visit our " ).AppendHyperlink( link ).Append( " for more information." );

        // Save the changes to the document
        document.Save();
      }
    }