List<string> words = new List<string>() { "an", "apple", "a", "day" };var query = from word in wordsselect word.Substring(0, 1);foreach (string s in query)Console.WriteLine(s);/* This code produces the following output:aaad*/

            List<string> phrases = new List<string>() { "an apple a day", "the quick brown fox" };var query = from phrase in phrasesfrom word in phrase.Split(' ')select word;foreach (string s in query)Console.WriteLine(s);/* This code produces the following output:anappleadaythequickbrownfox*/

class Bouquet
{public List<string> Flowers { get; set; }
}static void SelectVsSelectMany()
{List<Bouquet> bouquets = new List<Bouquet>() {new Bouquet { Flowers = new List<string> { "sunflower", "daisy", "daffodil", "larkspur" }},new Bouquet{ Flowers = new List<string> { "tulip", "rose", "orchid" }},new Bouquet{ Flowers = new List<string> { "gladiolis", "lily", "snapdragon", "aster", "protea" }},new Bouquet{ Flowers = new List<string> { "larkspur", "lilac", "iris", "dahlia" }}};// *********** Select ***********            IEnumerable<List<string>> query1 = bouquets.Select(bq => bq.Flowers);// ********* SelectMany *********IEnumerable<string> query2 = bouquets.SelectMany(bq => bq.Flowers);Console.WriteLine("Results by using Select():");// Note the extra foreach loop here.foreach (IEnumerable<String> collection in query1)foreach (string item in collection)Console.WriteLine(item);Console.WriteLine("\nResults by using SelectMany():");foreach (string item in query2)Console.WriteLine(item);/* This code produces the following output:Results by using Select():sunflowerdaisydaffodillarkspurtuliproseorchidgladiolislilysnapdragonasterprotealarkspurlilacirisdahliaResults by using SelectMany():sunflowerdaisydaffodillarkspurtuliproseorchidgladiolislilysnapdragonasterprotealarkspurlilacirisdahlia*/}