c# custom stack implementation. There is already a Stack type in .NET library. Mine is for training purposes.

gistfile1.cs

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

namespace ConsoleApplication2
{
    class Program
    {

        public class linkedNode<T>
        {
            public linkedNode<T> next;
            public T Data;
            public linkedNode(T Data)
            {
                this.Data = Data;
            }
        }

        public class customStack<T>
        {
            public void Traverse()
            {
                linkedNode<T> cursor = head;
                while (cursor != null)
                {
                    Console.WriteLine(cursor.Data);
                    cursor = cursor.next;
                }
            }
            linkedNode<T> head;
            linkedNode<T> tail;
            
            // returns the head without removing it
            public linkedNode<T> Peek()
            {
                if (head == null)
                    throw new Exception("the stack is empty");
                return head;
            }

            // returns the head and removes it
            public linkedNode<T> Pop()
            {
                if (head == null)
                    throw new Exception("the stack is empty");

                linkedNode<T> node = new linkedNode<T>(head.Data);
                head = head.next;
                return node;
            }

            public void Push(linkedNode<T> node)
            {
                if (head != null)
                    node.next = head;
                else
                {
                    node.next = null;
                    tail = node;
                }
              
                head = node;    
            }
        }

        static void Main(string[] args)
        {
            customStack<string> stack = new customStack<string>();
            stack.Push(new linkedNode<string>("first"));
            stack.Push(new linkedNode<string>("second"));
            stack.Push(new linkedNode<string>("third"));
            stack.Traverse();
            Console.WriteLine("now try to peek");
            Console.WriteLine(stack.Peek().Data);
            Console.WriteLine("traverse again");
            stack.Traverse();
            Console.WriteLine("now try to pop");
            Console.WriteLine(stack.Pop().Data);
            Console.WriteLine("traverse again");
            stack.Traverse();
            Console.WriteLine("pop two more and traverse again");
            stack.Pop(); stack.Pop(); stack.Traverse();
            Console.WriteLine("push the items back and traverse again");
            stack.Push(new linkedNode<string>("first"));
            stack.Push(new linkedNode<string>("second"));
            stack.Push(new linkedNode<string>("third"));
            stack.Traverse();
        }
    }
}