If you need translations to C#, I suggest you use http://labs.developerfusion.co.uk/convert/vb-to-csharp.aspx

Here are the snippets:

 On the page where you use webscheduleinfo, in page load, add handlers for the activity added, updated and deleted event, like this:

        'Add a handler for the customer activity added event
        AddHandler WebScheduleInfo1.ActivityAdded, AddressOf Me.AddCustomerActivity
        'Add a handler for the customer activity deleted event
        AddHandler WebScheduleInfo1.ActivityDeleted, AddressOf Me.DeleteCustomerActivity
        'Add a handler for the customer activity updated event
        AddHandler WebScheduleInfo1.ActivityUpdated, AddressOf Me.UpdateCustomerActivity

Then in each handler, add some additional logic to add/update/delete the mirror appointment, for example:

 Private Sub AddCustomerActivity(ByVal s As Object, ByVal e As Infragistics.WebUI.WebSchedule.ActivityEventArgs)

        'Capture the newly added activity 
        Try

            Dim cusappointment As Infragistics.WebUI.WebSchedule.Appointment
            cusappointment = e.Activity

     Dim eventid as integer = e.datakey

            Dim cusScheduleInfo As Infragistics.WebUI.WebSchedule.WebScheduleInfo
            cusScheduleInfo = cusappointment.ScheduleInfo
            cusScheduleInfo.DataBind()

            AddMirrorActivity(WebScheduleInfoAgg, WebScheduleInfo1, SqlDataSourceAgg, WebScheduleSqlClientProviderAgg, eventid, ....)

           .....

        Catch etc.
        End Try

    End Sub

 Private Sub AddMirrorActivity(ByVal WebScheduleInfoAggregate As WebScheduleInfo, ByVal WebScheduleInfoReal As WebScheduleInfo, ByVal SqlDataSourceAggregate As SqlDataSource, ByVal WebScheduleSqlClientProviderAggregate As WebScheduleSqlClientProvider, ByVal AppointmentID As Integer ...)

        Try

            WebScheduleInfoAggregate.ActiveResourceName = "Aggregate"

            SqlDataSourceAggregate.DataBind()
            WebScheduleInfoAggregate.DataBind(

            Dim realappt As Appointment
            realappt = FindAppointment(AppointmentID, WebScheduleInfoReal)

            If Not IsNothing(realappt) Then

                'Now create a new mirror appointment for the Aggregate resource
                WebScheduleInfoAggregate.DataBind()
                Dim appt As New Appointment(WebScheduleInfoAggregate)

                appt.EndDateTime = realappt.EndDateTime
                appt.Duration = realappt.Duration
                appt.AllDayEvent = realappt.AllDayEvent
                appt.Status = realappt.Status
                appt.Subject = realappt.Subject
                appt.StartDateTime = realappt.StartDateTime
                appt.Description = realappt.Description
                appt.ShowTimeAs = realappt.ShowTimeAs
                appt.ResourceKey = WebScheduleInfoAggregate.ActiveResource.DataKey

                WebScheduleInfoAggregate.Activities.Add(appt)
                WebScheduleSqlClientProviderAggregate.AddActivity(appt, WebScheduleInfoAggregate.ActiveResource)
                SqlDataSourceAggregate.DataBind()
                WebScheduleInfoAggregate.DataBind()

                Dim NewApptKey As Integer = appt.DataKey
             AddAppointmenttLink(Appointmentid, NewApptKey ...)

      .....

        Catch etc..
        End Try

    End Sub

Now replicate this approach for the update and delete handlers .....

In your page which displays the aggregate resource, bind the dayview to the aggregate resource, which will then contain only the "mirror" appointments.

Regards.

Mike