Check If Cycle exists in a Linked List

Check if the linked list contains a cycle

using System;
using System.Collections.Generic;
using System.Text;

namespace Algorithms
{
    public class LinkedList
    {
        private Node head;

        public LinkedList()
        {
            head = null;
        }

       
        public bool CheckCycle()
        {
            Node step1Node = head;
            Node step2Node = head.NextNode;
            
            while (true)
            {
                if ((step2Node == null)||(step2Node.NextNode == null))
                    return false;
                else if ((step1Node.Equals(step2Node))||(step1Node.Equals(step2Node.NextNode)))
                    return true;
                else
                { 
                step2Node = step2Node.NextNode;
                step2Node = step2Node.NextNode;
                step1Node = step1Node.NextNode;
                }
            }
        }
        public int FindPosition(int data)
        {
            Node checkNode = head;
            int position = 1;
            int dataPosition = 0;
            while (checkNode != null)
            {
                if (checkNode.DataValue == data)
                {
                    dataPosition = position;
                }
                checkNode = checkNode.NextNode;
                position = position + 1;
            }
            return dataPosition;

        }
    }
    public class Node
    {
        private int dataValue;
        private Node nextNode = null;

        public Node(int data)
        {
            dataValue = data;
        }
        public Node NextNode
        {
            get
            {
                return nextNode;
            }
            set
            {
                nextNode = value;
            }
        }
        public int DataValue
        {
            get
            {
                return dataValue;
            }
            set
            {
                dataValue = value;
            }
        }

    }
}