Remove Duplicates From List in C#

To Remove Duplicates From List can be done by many different ways. You can use Distinct extension method to remove duplicates.

Below program that removes duplicates from the list in C#.

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
       // List having duplicate integer elements.
       List<int> list = new List<int>();
       list.Add(7);
       list.Add(2);
       list.Add(5);
       list.Add(5);
       list.Add(2);
       list.Add(3);
       list.Add(7);

        // Get distinct elements and convert again into a list.
       List<int> distinct = list.Distinct().ToList();

       foreach (int value in distinct)
       {
           Console.WriteLine("Distinct : {0}", value);
       }
    }
}

 OR

You can use LINQ to object to remove duplicates from list,

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        // List having duplicate string elements.
        List<string> list = new List<string>();
        list.Add("A");
        list.Add("A");               
        list.Add("C");
        list.Add("D");
        list.Add("B");
        list.Add("A");
        list.Add("E");
        list.Add("E");

        // Get distinct elements.
        var distinct = (from item in list  orderby item  select  item).Distinct();
       
        foreach (string value in distinct)
        {
             Console.WriteLine("Distinct : {0}", value);
        }
    }
}