LINQ to XML - subclassing XElement

You should use encapsulation, rather than inheritance here.

 class TopLevelBlock
  {
    readonly XElement doc;

    TopLevelBlock(string name)
    {
      doc = new XElement((XName)name);
      doc.SetAttributeValue("someAttribute","");

    }

    public int someAttribute
    {
      get
      {
        return int.Parse(doc.Attribute("someAttribute").Value);
      }
      set
      {
        doc.SetAttributeValue("someAttribute", value.ToString());
      }
    }
  }

Or perhaps XML Serialization.

David

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David http://blogs.msdn.com/b/dbrowne/