title: Using in Class Property MemoryStream and IDisposable
body: <p>I am creating an excel and powerpoint document using openxml.
  As I do not want to create emtpy file, I want to be sure to write the document only when it is complete using my own <code>Save</code> methods. It works weel.</p>
  
  <p>Though, during development, when it crashes, it usually block the DLL file for a while. I was thinking that IDisposable was not properly called. Is there a way to define a using in my class properties <code>_MemStream</code>?</p>
  
  <pre><code>public partial class Presentation
  {
    public Pa.PresentationDocument PresentationDoc { get; set; }   //PresentationPart parts
    private MemoryStream _MemStream { get; set; }
  
    public void Init(string FileName = "NoName")
    {
      //Init stream
      this._MemStream = new MemoryStream();
      this.PresentationDoc = Pa.PresentationDocument.Create(
      this._MemStream, PresentationDocumentType.Presentation);
      // Create the presentation
    }
    public string Save(string path)
    {
      this.PresentationDoc.Close();
      using (FileStream fileStream = new FileStream(FileTemp,
      System.IO.FileMode.CreateNew))
      {
        this._MemStream.WriteTo(fileStream);
      }
  
      this._MemStream.Flush();
    }
  }
  </code></pre>