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XDocument xd = XDocument.Parse(@"
    <xml>
        <book Author=""Moszi"" Title=""First book"" />
        <book Author=""Eszto"" Title=""Second book"" />
        <book Author=""Eszto"" Title=""Second book - 2nd edition"" />
    </xml>");

var q = from c in xd.Descendants()
        where c.Name == "book" && c.Attribute("Author").Value == "Eszto"
        select new { Author = c.Attribute("Author").Value,
                     Title = c.Attribute("Title").Value
        };


foreach (var qValue in q)
{
    Console.WriteLine(qValue);
}