pop up after a certain time

Hello, I'm new to Vb.net and I have a problem with regards to my project
here's a sample code

Private Sub MinsToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MinsToolStripMenuItem.Click
        Dim b As Boolean
        MsgBox(" pop up will return on " & Now.AddMinutes(5))

        Dim a = Now.AddMinutes(5)
        Try
            b = System.Convert.ToBoolean(a)

        Catch exception As System.InvalidCastException
            If a = True Then
                PopupNotifier1.Popup()

            End If
        End Try
    End Sub

what i want is that when i click the ToolStripMenuItem, it will wait for five minutes and then popnotifier1 will popup...

any help will be appreciated...

Tags: Visual Basic