2つのWordファイルの内容が一致しているかどうかを比較するC#解決方法

using System;
using System.Windows.Forms;
using System.Diagnostics;
using Microsoft.Office.Interop.Word;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
       
        private void button1_Click(object sender, EventArgs e)
        {
            // WORD.EXE ， ， , 
            KillProcess();

            MessageBox.Show(CompareWordFile(@"C:\1.DOC", @"C:\2.DOC").ToString());
        }

        public bool CompareWordFile(String source, String target)
        {
            object filename = source;
            var targetFileName = target;
            object missing = System.Reflection.Missing.Value;
            object readonlyobj = false;
            var app = new ApplicationClass { Visible = false };
            var doc = app.Documents.Open(ref filename, ref missing, ref readonlyobj, ref missing,
                ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing, ref missing);
            doc.TrackRevisions = true;
            doc.ShowRevisions = true;
            doc.PrintRevisions = true;
            object comparetarget = WdCompareTarget.wdCompareTargetNew;
            doc.Compare(targetFileName, ref missing, ref comparetarget, ref missing, ref missing, ref missing, ref missing, ref missing);
            var changeCount = app.ActiveDocument.Revisions.Count;
            Object saveChanges = WdSaveOptions.wdDoNotSaveChanges;
            doc.Close(ref saveChanges, ref missing, ref missing);
            app.Quit(ref saveChanges, ref missing, ref missing);
            return changeCount == 0;
        }

        public void KillProcess()
        {
            const string processName = "WINWORD";
            var process = Process.GetProcessesByName(processName);
            try
            {
                foreach (var p in process)
                {
                    p.Kill();
                }
            }
            catch (Exception)
            {
                MessageBox.Show(" WINWORD.EXE !", " ", MessageBoxButtons.OK);
                return;
            }
        }
    }
}