remove duplicates, C#

remove duplicates

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using COLG = System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Node
    {
        public int data;
        public Node next;

public Node (int value, Node nextNode)
        {
            data = value;
            next = nextNode;
        }
    }

public class Program
    {

public Node RemoveDuplicates (Node head)
        {
            COLG.List<Node> knownNodes = new COLG.List<Node>();

Node focus = head;

while (focus != null)
            {
                if (knownNodes.Exists(x => x.data == focus.data))
                {
                    knownNodes.Add(focus);
                }
                else
                {
                    
                }
            }
        }

public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
        }
    }
}


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