fun.cs

using System;
using System.Collections.Generic;

namespace ConsoleApplication1 {
  class Program {
    static void Main() {
      //-- define an Action that will perfom a query
      Action<List<string>> query = r => r.AddRange(QuerySomething());

      //-- invoke it and show results ;)  
      var result = new List<string>();
      query(result);
      result.ForEach(Console.WriteLine);
      Console.ReadLine();
    }

    static IEnumerable<string> QuerySomething() {
      yield return "just ";
      yield return "for ";
      yield return "fun ";
      yield return ":) ";
    }
  }
}