using System;

using System.Collections.Generic;

using System.Linq;

​

class Program

{

    static void Main()

    {

    // List with duplicate elements.

    List<int> list = new List<int>();

    list.Add(1);

    list.Add(2);

    list.Add(3);

    list.Add(3);

    list.Add(4);

    list.Add(4);

    list.Add(4);

​

    foreach (int value in list)

    {

        Console.WriteLine("Before: {0}", value);

    }

​

    // Get distinct elements and convert into a list again.

    List<int> distinct = list.Distinct().ToList();

​

    foreach (int value in distinct)

    {

        Console.WriteLine("After: {0}", value);

    }

    }

}