Open XML C# and Word docx documents

openxml sdk2.5  : http://download.microsoft.com/download/5/5/3/553C731E-9333-40FB-ADE3-E02DC9643B31/OpenXMLSDKV25.msi

openxml Tool v2.5: http://download.microsoft.com/download/5/5/3/553C731E-9333-40FB-ADE3-E02DC9643B31/OpenXMLSDKToolV25.msi

dome: RemoveComments

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Xml;
using System.Xml.Linq;
using DocumentFormat.OpenXml.Packaging;

namespace AcceptRevisions
{
    public static class LocalExtensions
    {
        public static XDocument GetXDocument(this OpenXmlPart part)
        {
            XDocument xdoc = part.Annotation<XDocument>();
            if (xdoc != null)
                return xdoc;
            using (StreamReader sr = new StreamReader(part.GetStream()))
            using (XmlReader xr = XmlReader.Create(sr))
                xdoc = XDocument.Load(xr);
            part.AddAnnotation(xdoc);
            return xdoc;
        }
    }

    class Program
    {
        public static void RemoveComments(WordprocessingDocument document)
        {
            // remove w:commentRangeStart, w:commentRangeEnd, w:commentReference
            XNamespace w = "http://schemas.openxmlformats.org/wordprocessingml/2006/main";
            XDocument mainDocumentXDoc = document.MainDocumentPart.GetXDocument();

            // pre-atomize the XName objects so that they are not atomized for every item in the collection
            XName commentRangeStart = w + "commentRangeStart";
            XName commentRangeEnd = w + "commentRangeEnd";
            XName commentReference = w + "commentReference";
            mainDocumentXDoc.Descendants()
                .Where(x => x.Name == commentRangeStart || x.Name == commentRangeEnd || x.Name == commentReference)
                .Remove();

            // remove the comment part
            document.MainDocumentPart.DeletePart(document.MainDocumentPart.WordprocessingCommentsPart);

            using (XmlWriter xw =
              XmlWriter.Create(document.MainDocumentPart.GetStream(FileMode.Create, FileAccess.Write)))
                mainDocumentXDoc.Save(xw);
        }

        public static bool HasComments(WordprocessingDocument document)
        {
            XNamespace w = "http://schemas.openxmlformats.org/wordprocessingml/2006/main";
            XDocument mainDocumentXDoc = document.MainDocumentPart.GetXDocument();
            return mainDocumentXDoc.Descendants(w + "commentReference").Any();
        }

        static void Main(string[] args)
        {
            using (WordprocessingDocument doc = WordprocessingDocument.Open("Test.docx", true))
            {
                Console.WriteLine(HasComments(doc));
                RemoveComments(doc);
                Console.WriteLine(HasComments(doc));
            }
        }
    }
}

　save Document:

byte[] byteArray = File.ReadAllBytes("c:\data\hello.docx");
using (MemoryStream stream = new MemoryStream())
{
    stream.Write(byteArray, 0, (int)byteArray.Length);
    using (WordprocessingDocument wordDoc = WordprocessingDocument.Open(stream, true))
    {
       // Do work here
    }
    // Save the file with the new name
    File.WriteAllBytes("C:\data\newFileName.docx", stream.ToArray()); 
}