public static void Main()
string xml = @"<?xml version=""1.0"" encoding=""utf-8"" ?>
<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>
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:");