System.Printing not found

I am wrinting a MS Word Addin using .Net 4.0 that requires access to System.Printing.  However I can't resolve the reference to System.Printing.  In the following code sample everything is happy except 'using System.Printing' which is highlighted as an error.  Help please!

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using System.Printing;
using Word = Microsoft.Office.Interop.Word;
using Office = Microsoft.Office.Core;
using Microsoft.Office.Tools.Word;
using Microsoft.Office.Tools.Word.Extensions;

namespace APTWord2010MWB
    public partial class ThisAddIn
Who is Participating?
BuggyCoderConnect With a Mentor Commented:
Simply add reference to System.Printing from Add Reference option in VS.
PeterC_UKDirectorAuthor Commented:
Thank you - As a C++ programmer this is a first c# .Net project so have some learning to do :-)
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