How to use C# Stack Class

The Stack class represents a last-in-first-out (LIFO) Stack of Objects. Stack follows the push-pop operations. That is we can Push (insert) Items into Stack and Pop (retrieve) it back . Stack is implemented as a circular buffer. It follows the Last In First Out (LIFO) system. That is we can push the items into a stack and get it in reverse order. Stack returns the last item first. As elements are added to a Stack, the capacity is automatically increased as required through reallocation.

Commonly used methods :

  1. Push : Add (Push) an item in the Stack data structure
  2. Pop : Pop return the last Item from the Stack
  3. Contains: Check the object contains in the Stack

Push : Add (Push) an item in the Stack data structure

  1. Object : The item to be inserted.
Stack days = new Stack(); days.Push("Sunday");

Pop : Pop return the item last Item from the Stack

Object Stack.Pop()
  1. Object : Return the last object in the Stack

Contains : Check the object contains in the Stack

  1. Object : The specified Object to be search

The following CSharp Source code shows some of important functions in Stack Class:

Full Source C#
using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace WindowsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Stack days = new Stack(); days.Push("SunDay"); days.Push("MonDay"); days.Push("TueDay"); days.Push("WedDay"); days.Push("ThuDay"); days.Push("FriDay"); days.Push("SaturDay"); if (days.Count ==7) { MessageBox.Show(days.Pop().ToString ()); } else { MessageBox.Show("SaturDay does not exist"); } } } }

When you execute this C# program add seven items in the stack . Then it check the count is equal to 7 , if it is seven then pop() the item. The message box will display SaturDay.