public class Node{ public int Data { get; set; } public Node Next { get; set; } public Node(int data) {   this.Data = data; }}public class Queue{ private Node _head; private Node _tail; private int _count = 0; public Queue() { } public void Enqueue(int data) {   Node _newNode = new Node(data);   if (_head == null)   {    _head = _newNode;    _tail = _head;   }   else   {    _tail.Next = _newNode;    _tail = _tail.Next;   }   _count++; } public int Dequeue() {   if (_head == null)   {    throw new Exception("Queue is Empty");   }   int _result = _head.Data;   _head = _head.Next;   return _result; } public int Count {   get   {    return this._count;   } }}