using System;

using System.Xml;

using System.Xml.Linq;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var inputXML = @"<elementList xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xsd='http://www.w3.org/2001/XMLSchema'>

            <NodePrime>

                <Node>

                     <NodeA>1</NodeA>

                     <NodeB>2</NodeB>

                </Node>

                <Node>

                     <NodeA>3</NodeA>

                     <NodeB>4</NodeB>

                </Node>

             </NodePrime>

             </elementList>";

​

        var ItemList = new List<dynamic>();

        var doc = XDocument.Parse(inputXML);

        var xmlnode = doc.Descendants("Node");

        foreach(var item in xmlnode)

        {

            var ListA = new 

            {

                itemA = item.Element("NodeA").Value,

                itemB = item.Element("NodeB").Value

            };

            ItemList.Add(ListA );

        }

        Console.WriteLine(ItemList.Count());

    }

}