Remove object from generic list by id

I have a domain class like this:

public class DomainClass
{
  public virtual string name{get;set;}
  public virtual IList<Note> Notes{get;set;}
}

How would I go about removing an item from the IList<Note>? I would be able to do it if it was a List but it has to be an IList as I am using Nhibernate for my persistance layer.

Ideally I wanted a method like this in my domain class:

public virtual void RemoveNote(int id)
{
   //remove the note from the list here

   List<Note> notes = (List<Note>)Notes

   notes.RemoveAll(delegate (Note note)
   {
       return (note.Id = id)
   });
}

But I can't cast the IList as a List. Is there a more elegant way round this?