Namespace DotNetNuke.Modules.Events
    Public Class EventNotification
        Inherits DotNetNuke.Services.Scheduling.SchedulerClient

#Region "Constructors"
        Public Sub New(ByVal objScheduleHistoryItem As DotNetNuke.Services.Scheduling.ScheduleHistoryItem)
            MyBase.new()
            Me.ScheduleHistoryItem = objScheduleHistoryItem
        End Sub
#End Region

#Region "Methods"
        Public Overrides Sub DoWork()
            Try
            ...
            ...

public class EventNotification : DotNetNuke.Services.Scheduling.SchedulerClient
{
    public EventNotification(DotNetNuke.Services.Scheduling.ScheduleHistoryItem objScheduleHistoryItem)
    {
        base();
        this.ScheduleHistoryItem = objScheduleHistoryItem;
    }

    public override DoWork()
    {
        // Do some stuff
    }
}