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