Maybe a candidate for Mono.Rocks

Answering a thread on XmlNodeList manipulation on the list I came with this answer and (untested) Mono.Rocks candidate:

As a fan of generics I would create a helper class (based on Robert Jordan code):

public class XmlNodeListHelper
{
   public static List CopyNodeList(XmlNodeList list)
     {
       List copy = new List();
 
       foreach (XmlNode node in list)
       copy.Add (node);
            return copy;
   }

   public static void RemoveNodes(XmlNodeList list)
   {
       foreach (XmlNode node in CopyNodeList(list))
           node.ParentNode.RemoveChild(node);
   }
}

And so the code in question would become just:

XmlNodeListHelper.RemoveNodes(xDoc.SelectNodes("//comment()"));

When using the latest compilers it could be made into a Mono.Rocks helper like:

public class XmlNodeListHelper
{
  public static List CopyAsList(this XmlNodeList list)
  {
      List copy = new List();
 
      foreach (XmlNode node in list)
          copy.Add (node);
    
      return  copy;
  }

  public static void RemoveNodes(this XmlNodeList list)
     {
      foreach (XmlNode node in list.CopyAsList())
          node.ParentNode.RemoveChild(node);
  }
}

And then usage would be even simpler

Doc.SelectNodes("//comment()").RemoveNodes();