[2008] bgworker and events

I am creating a class that wraps around google calender so i can talk with my good calender through my application.

Code:

---

Imports Google
Imports Google.GData.Calendar
Imports Google.GData.Client
Imports Google.GData.Extensions

Public Class gcalwrapper
    Private _serviceName As String
    Private myService As CalendarService

    Protected Property servicename() As String
        Get
            Return _serviceName
        End Get
        Set(ByVal value As String)
            _serviceName = value
        End Set
    End Property
    Public Event AppointmentComingUp()

    Public Sub New()
        If String.IsNullOrEmpty(servicename) Then
            myService = New CalendarService("CalendarService")
        Else
            myService = New CalendarService(servicename)
        End If
    End Sub

    Public Sub New(ByVal sname As String)
        servicename = sname
        myService = New CalendarService(servicename)
    End Sub
    Public Sub startTimeMonitor()
        RaiseEvent AppointmentComingUp()

    End Sub
End Class

---

In my test form I have a button click event that has the code

Code:

---

  Dim gc As New gcalwrapper("Testservice")
        AddHandler gc.AppointmentComingUp, AddressOf gc_AppointmentComingUp
        gc.setCrediantials("affan05", "***")
        gc.startTimeMonitor()

---

and the appropriate sub that handles the addressof; in that sub I have a simple msgbox.
THIS IS MY FIRST TIME WITH EVENTS, so i decided to go with addhandler since MSDN told me it would be better in my situation. with handles/withevents i'd have to declare a public withevetns variable.
IMO I like this way the best even though i dont know delegates yet.

ANYWAY. so my whole plan is to creatte like a background thread (Backgroundworker) in my initial form load. I want this to have a infinte timer that runs and retreives events and does a check whether an event is cmoing up in the next 30 minutes. all this is gonna be taking place in the sub startTimeMonitor thats in the class, and if something happens then it raises the event.

finally to my question. I have a MDI form with chid forms that get opened and closed (not hidden but closed). Would it be wise to create a bgworker in my MDI form class? that way it would run for ever, even with other forms opening and closing?

and what about the associating subroutine? Would that also go in my MDI form?