using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Xml.Serialization;

  public class ServerDetails

    {

        public string ServerName { get; set; }

        public string ServerIP { get; set; }

    }

    public class Servers

    {        

        [XmlElement("Server")]

        public ServerDetails[] ServersDetails { get; set; }

    }

    public class Program

    {

        public static void Main(string[] args)

        {

            GetXMLData();

        }

        private static void GetXMLData()

        {

           XmlSerializer serializer = new XmlSerializer(typeof(Servers));

           var str = @"<?xml version=""1.0"" encoding=""utf-8"" ?>

            <Servers>

              <Server>

                <ServerName>STAGING</ServerName>

                <ServerIP>XXX.XXX.XX.X</ServerIP>        

              </Server>

              <Server>

                <ServerName>STAGING</ServerName>

                <ServerIP>XXX.XXX.XX.X</ServerIP>        

              </Server>

            </Servers>

            ";

           // StringBuilder strB = new StringBuilder(str);

          using (var s = new StringReader(str))

            {

                Servers list = (Servers)serializer.Deserialize(s);

                //Exception here

                Console.WriteLine(list.ServersDetails[0].ServerIP);

            }

        }

    }