Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, 
	ByVal e As System.EventArgs) Handles Button1.Click
        Dim stackTable As New Stack
        stackTable.Push("Sun")
        stackTable.Push("Mon")
        stackTable.Push("Tue")
        stackTable.Push("Wed")
        stackTable.Push("Thu")
        stackTable.Push("Fri")
        stackTable.Push("Sat")
        If stackTable.Contains("Wed") Then
            MsgBox(stackTable.Pop())
        Else
            MsgBox("not exist")
        End If
    End Sub
End Class