using System;

using System.Linq;

using System.Collections.Generic;

​

public class Simple {

  public static void Main() {

      var vouchers = new List<Voucher>

      {

          new Voucher { ID = 1, AddedOn = DateTime.Now, Amount = 800 },

          new Voucher { ID = 2, AddedOn = DateTime.Now, Amount = 300 },

          new Voucher { ID = 3, AddedOn = DateTime.Now.AddDays(1), Amount = 400 },

          new Voucher { ID = 4, AddedOn = DateTime.Now.AddDays(2), Amount = 500 },

          new Voucher { ID = 5, AddedOn = DateTime.Now.AddDays(3), Amount = 600 },

          new Voucher { ID = 6, AddedOn = DateTime.Now.AddDays(3), Amount = 100 }

      };

      var bals = from v in vouchers

          group v by v.AddedOn into grp

          select grp.OrderBy(g=>g.Amount).First();

      foreach (var item in bals)

      {

            Console.WriteLine("ID="+item.ID + " AddedOn="+item.AddedOn + " Amount=" + item.Amount);   

      }

    string[] names = { "Burke", "Laptop", "Computer", 

                       "Mobile", "Ahemed", "Sania", 

                       "Kungada", "David","United","Sinshia" };

​

    var  query = from s in names 

                               where s.Length == 6

                               orderby s

                               select s.ToUpper();

​

    foreach (string item in query)

      Console.WriteLine(item);

  }

}

​

public class Voucher

{

    public int ID {get; set;}

    public int Amount {get; set;}

    public DateTime AddedOn {get; set;}

}