title: issue with saving doc file
body: <p>I am editing doc file using openxml in c# and want to save it. Changes is made but the file could not be save. when I open the file it doesn't show any changes made. I did it with follow code.</p>
  
  <pre><code>using (WordprocessingDocument doc = WordprocessingDocument.Open(source, true))
  {
      using (StreamReader reader = new StreamReader(doc.MainDocumentPart.GetStream()))
      {
          documentText = reader.ReadToEnd();
      }
  
      Body body = doc.MainDocumentPart.Document.Body;
      documentText = documentText.Replace("##date##", "02/02/2014");
      documentText = documentText.Replace("##saleno##", "2014");
      documentText = documentText.Replace("##Email##", "abc");
      documentText = documentText.Replace("##PhoneNo##", "9856321404");
      doc.MainDocumentPart.Document.Save();
      doc.Close();
  }
  </code></pre>
  
  <p>Please help.
  Thanks.</p>