using System;

using System.Linq;

using System.Xml.Linq;  

using System.Xml;

​

public class Program

{

    public static void Main()

    {

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

  <response>

  <count>1744</count>

  <items list=""true"">

  <user_id>166157278</user_id> 

  <user_id>180513789</user_id> 

  <user_id>196643727</user_id> 

  <user_id>217769882</user_id> 

  <user_id>202490982</user_id> 

  <user_id>236994020</user_id> 

  <user_id>197145226</user_id> 

  <user_id>114320712</user_id> 

  <user_id>218299387</user_id> 

  <user_id>44343148</user_id> 

  </items>

  </response>";

​

            XDocument xd = XDocument.Parse(xml);

            int count = (int)xd.Root.Element("count");

            int[] id = xd.Root.Descendants("user_id").Select(x => (int)x).ToArray();

            Console.WriteLine("Count: {0}", count);

            Console.WriteLine("ID:");

            foreach (var x in id)

                Console.WriteLine(x);

    }

}