Adding Items to the Queue :

To add items to the Queue you use Enqueue method. This method takes an object of any type but to keep things simple lets just give it a string object:

Queue q = new Queue();
q.Enqueue("am");
q.Enqueue("inserting");
q.Enqueue("value");
q.Enqueue("to");
q.Enqueue("Queues");
q.Enqueue("List");

Viewing a Single Object Without Removing it From the Queue :

You can use the Peak method to get the topmost object in the queue without removing it from the queue:

Response.Write(q.Peek());

Viewing All the Objects in the Queue Without Removing Them :

You can read any of the data in the Queue by using an enumerator:

System.Collections.IEnumerator en = q.GetEnumerator();
while (en.MoveNext())
{
Response.Write(en.Current +" ");
}

Removing Items from the Queue :

To pop an item from the Queue you can use the Dequeue statement. This returns the topmost object of the queue.

while( q.Count > 0)
{
Response.Write(q.Dequeue +" ");
}

__________________
J.Saravanan

What if i need to just see the Top element without removing it from the Queue

using System;
using System.Collections;
using System.Windows.Forms;
using System.Drawing;

class QueueDemo : Form
{
static Queue simpleQueue;
Button btnEnQueue,btnPeek,btnDeQueue;
TextBox txtItem;
Label lblItem,lblQueue;
ListBox lstQueueUI;

public QueueDemo()
{
simpleQueue = new Queue(32);
lblItem = new Label();
lblItem.Text = "Item To Add";
lblItem.Location = new Point(16,16);
lblItem.AutoSize = true;

txtItem = new TextBox();
txtItem.Location = new Point(lblItem.Right + 8 ,lblItem.Top);
txtItem.Size = new Size(256,27);

btnEnQueue = new Button();
btnEnQueue.Size = btnEnQueue.Size;
btnEnQueue.Location = new Point(txtItem.Right + 8,lblItem.Top);
btnEnQueue.Text = "EnQueue";
btnEnQueue.Click += new EventHandler(btnEnQueue_Click);

btnPeek = new Button();
btnPeek.Size = btnEnQueue.Size;
btnPeek.Location = new Point(btnEnQueue.Right + 8,lblItem.Top);
btnPeek.Text = "Peek";
btnPeek.Click += new EventHandler(btnPeek_Click);

btnDeQueue = new Button();
btnDeQueue.Size = btnEnQueue.Size;
btnDeQueue.Location = new Point(btnPeek.Right + 8,lblItem.Top);
btnDeQueue.Text = "DeQueue";
btnDeQueue.Click += new EventHandler(btnDeQueue_Click);

lblQueue = new Label();
lblQueue.Location = new Point(lblItem.Left,lblItem.Bottom + 32);
lblQueue.Text = "Visual Queue";

lstQueueUI = new ListBox();
lstQueueUI.Location = new Point(lblItem.Left,lblQueue.Bottom + 16);
lstQueueUI.Size = new Size(512,256);

this.Text = "Queue Demo";
this.Controls.AddRange( new Control[]
{
lblItem,txtItem,
btnEnQueue,btnPeek,btnDeQueue,
lblQueue,lstQueueUI
});
}

void btnEnQueue_Click(object sender,EventArgs e)
{
if(txtItem.Text.Trim() != String.Empty)
{
simpleQueue.Enqueue(txtItem.Text.Trim());
lstQueueUI.Items.Insert(lstQueueUI.Items.Count,
"Added Element: " + txtItem.Text.Trim() + " At " + DateTime.Now.ToString());
}
else
{
MessageBox.Show("Empty Value Cannot be Added","QueueDemo",
MessageBoxButtons.OK,MessageBoxIcon.Information);
}
}

void btnPeek_Click(object sender,EventArgs e)
{
try
{
MessageBox.Show("Peek Element: "
+ simpleQueue.Peek().ToString());
}
catch(Exception ex)
{
MessageBox.Show("Error: " + ex.Message,"QueueDemo",
MessageBoxButtons.OK,MessageBoxIcon.Error);
}
}

void btnDeQueue_Click(object sender,EventArgs e)
{
try
{
MessageBox.Show("Removed Element: " +

simpleQueue.Dequeue().ToString());
lstQueueUI.Items.RemoveAt(0);
}
catch(Exception ex)
{
MessageBox.Show("Error: " + ex.Message,"QueueDemo",
MessageBoxButtons.OK,MessageBoxIcon.Error);
}
}

static void Main()
{
Application.Run(new QueueDemo());
}
}

__________________
Shaalini.S
Be the Best of Whatever you are...