I've made the following class and put this in the App_Code directory:

Imports Microsoft.VisualBasic
Imports System.Configuration
Imports DotNetNuke
Imports System.Web
Imports DotNetNuke.Services.Scheduling

Namespace DotNetNuke.Services.Scheduling

    Public Class CurrentVisitorScheduledTask
        Inherits SchedulerClient

        Public Sub New(ByVal objScheduleHistoryItem As ScheduleHistoryItem)
            MyBase.New()
            Me.ScheduleHistoryItem = objScheduleHistoryItem
        End Sub

        Public Overrides Sub DoWork()
            Try
                ' Delete all visitors who haven't accessed a page for 5 minutes or more

                Dim con As New SqlConnection(ConfigurationManager.AppSettings("SiteSqlServer"))
                Dim cmd As New SqlCommand("BDB_DeleteCurrentVisitors", con)
                cmd.CommandType = CommandType.StoredProcedure

                Try
                    con.Open()
                    cmd.ExecuteNonQuery()
                    con.Close()
                Catch ex As Exception
                    If con.State = ConnectionState.Open Then
                        con.Close()
                    End If
                End Try


                ' then report success to the scheduler framework
                ScheduleHistoryItem.Succeeded = True

            Catch ex As Exception
                ' handle any exceptions

                ' report a failure
                ScheduleHistoryItem.Succeeded = False

                ' log the exception into
                ' the scheduler framework
                ScheduleHistoryItem.AddLogNote("EXCEPTION" + ex.ToString())

                ' call the Errored method
                Errored(ex)

                ' log the exception into the DNN core
                Exceptions.LogException(ex)

            End Try

        End Sub
    End Class
End Namespace

Then I created a new schedule item with DotNetNuke.Services.Scheduling.CurrentVisitorScheduledTask as full class name and DOTNETNUKE as assembly. Unfortunately the schedule never works, what am I missing here?


 

Yes, I see the item in the Schedule Item list. But if I check the history of the item, no rows are shown.  Also, in 'View Schedule Status', my task is listed but 273,3518959  is filled in in the column Overdue(seconds) and nothing is filled in  in the column Time remaining (seconds).

Nothing happend unfortunately, but now I know why. The scheduler could not find the dll. I solved the matter by creating a seperate module and putting the compiled dll in the bin folder of the website. Now the schedule works perfectly.