The Queue is another adtastructure from VB.NET Collections . It works like FIFO system. That is First In First Out, The item added in Queue is , first get out from Queue. We can Enqueue (add) items in Queue and we can Dequeue (remove from Queue ) or we can Peek (that is get the reference of first item added in Queue ) the item from Queue.

The commonly using functions are follows :

Enqueue : Add an Item in Queue

Syntax : Stack.Enqueue(Object)

Object : The item to add in Queue

Dequeue : Remove the oldest item from Queue (we dont get the item later)

Syntax : Stack.Dequeue()

Returns : Remove the oldest item and return.

Peek : Get the reference of the oldest item (it is not removed permenantly)

Syntax : Stack.Peek()

returns : Get the reference of the oldest item in the Queue

The following VB.NET Source code shows some of commonly used functions :

VB.NET SourceCode

Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object,_
	ByVal e As System.EventArgs) Handles Button1.Click
        Dim queueList As New Queue
        queueList.Enqueue("Sun")
        queueList.Enqueue("Mon")
        queueList.Enqueue("Tue")
        queueList.Enqueue("Wed")
        queueList.Enqueue("Thu")
        queueList.Enqueue("fri")
        queueList.Enqueue("Sat")
        MsgBox(queueList.Dequeue())
        MsgBox(queueList.Peek())
        If queueList.Contains("Sun") Then
            MsgBox("Contains Sun ")
        Else
            MsgBox("Not Contains Sun ")
        End If
    End Sub
End Class