How to copy list from another list?

public class Person
   {
       readonly List<Person> _children = new List<Person>();
       public IList<Person> Children
       {
           get { return _children; }
       }

       public List<Person> _Rightchildren = new List<Person>();
       public IList<Person> RightChildren
       {
           get { return _Rightchildren; }
       }

       public string  Name            { get; set; }
       public bool IsChecked { get; set; }
       public string Psize { get; set; }
       public ulong   ullSector       { get; set; }
       public ulong   ullSize         { get; set; }
       public string fType { get; set; }
       public string path { get; set; }
      public ImageSource ListIcon { get; set; }
       public IntPtr pNext           { get; set; }
        public IntPtr pChild          { get; set; }
        public IntPtr pParent         { get; set; }

       public uint     dwID                 { get; set; }
       public uint     dwSelfNum            { get; set; }
       public uint     dwParentNum         { get; set; }

       public IntPtr   pwcName            { get; set; }

       public ushort   wCT               { get; set; }
       public ushort   wAT                { get; set; }

       public byte     bStatus             { get; set; }
       public byte     bMarked              { get; set; }
       public byte     bNameLength          { get; set; }
       public ImageSource SystemIcon { get; set; }
   }

public class NodeDetails
	{
		public  List<NodeDetails> _childrenList = new List<NodeDetails>();
		public List<NodeDetails> ChildrenList
		{
			get { return _childrenList; }
		}
		public string Name { get; set; }
		public string Size { get; set; }
		public ushort DateModified { get; set; }
		public string FType { get; set; }
		public string Path { get; set; }
		public ImageSource ListIcon { get; set; }
		public bool IsChecked { get; set; }
		public uint SelfNum { get; set; }

	}