One dummy example of LINQ:

using System;
using System.Linq;

namespace linqExamples
{
  class Program
  {
    static void Main(string[] args)
    {
      string s = "Test";
      var test = s.Select(d => "b");
      foreach(var b in test)
      {
        Console.WriteLine(b);
      }
      Console.ReadKey();
    }
  }
}