// Load the first document.
    using( var document1 = DocX.Load( "First.docx" ) )
    {
      // Load the second document.
      using( var document2 = DocX.Load( "Second.docx" ) )
      {
        // Insert a document at the end of another document.
        // When true, document is added at the end. When false, document is added at beginning.
        document1.InsertDocument( document2, true );
        // Save this document to disk.
        document1.SaveAs( "AppendDocument.docx" );
      }
    }