Queue(Enqueue and Dequeue)

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

    public partial class queue : Form

    {

        public queue()

        {

            InitializeComponent();

        }

        Queue<string> qu = new Queue<string>();

        private void btnen_Click(object sender, EventArgs e)

        {

            qu.Enqueue(textBox1.Text);

            listBox1.Items.Add(textBox1.Text);

            textBox1.Text = "";

        }

        private void btnde_Click(object sender, EventArgs e)

        {

            listBox1.Items.RemoveAt(0);

            listBox1.Refresh();

        }

    }

}