Asp repeater sorting data

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VB

ASP

ASP.NET

repeater

I' m not sure how or if this is possible but I have an ASP Repeater to display some data. The Datasource is ordered in the Page_Load event as below...

Protected Overloads Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
        If Not (Page.IsPostBack) Then

            'No need to re-load Occasion because it's done in the PreLoad event
            Me.Header.Title = "OCP - " + Occasion.Checklist.name

            pnlStatistics.Visible = Not (Occasion.isClosed)
            pnlClose.Visible = SecurityHelper.HasRole(SecurityMatchOption.AtLeast, SecurityRole.Manager, _relevantTeam) And Not (Occasion.isClosed)

            'initially assume checklist can be closed. any un-signed off task in the item_databound event will disable it.
            btnClose.Enabled = True

            'Fix Issue 63: rptTask.DataSource = _db.vw_tasklists.Where(Function(o) o.occasionId = Occasion.id).ToList()
            rptTask.DataSource = _db.vw_tasklists.Where(Function(o) o.occasionId = Occasion.id).OrderBy(Function(t) t.taskDueDate).ThenBy(Function(t) t.taskDueTime)

However within the ItemDataBound event we recalculate the taskduedate...

Private Sub rptTask_ItemDataBound(sender As Object, e As RepeaterItemEventArgs) Handles rptTask.ItemDataBound

        ' Get the data relating to this task 'row'
        Dim t = CType(e.Item.DataItem, vw_tasklist)

        If e.Item.ItemType = ListItemType.Header Then
            Dim thDueDate = CType(e.Item.FindControl("thDueDate"), HtmlTableCell)

            thDueDate.Visible = Not (Occasion.isClosed)
        End If

        'securable buttons

        If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then

            ' Dynamically create a span element named TASKnnnn, which will be referenced from
            ' 'child page' links back to this page in order to vertically reposition at the selected task
            Dim span = New HtmlGenericControl("span")
            span.ID = "TASK" & t.taskId
            span.ClientIDMode = ClientIDMode.Static                             ' prevent ASP.NET element ID mangling
            e.Item.FindControl("lblTaskName").Parent.Controls.AddAt(0, span)    ' hook it into the repeater row

            Dim btnSignoff = CType(e.Item.FindControl("btnSignOff"), Button)
            Dim btnComment = CType(e.Item.FindControl("btnComment"), Button)
            Dim btnAmend = CType(e.Item.FindControl("btnAmend"), Button)
            Dim btnView = CType(e.Item.FindControl("btnView"), Button)
            Dim lblSoTime = CType(e.Item.FindControl("lblSOTime"), Label)
            Dim lblDueDate = CType(e.Item.FindControl("lblDueDate"), Label)
            Dim lblTaskId = CType(e.Item.FindControl("lblTaskId"), Label)
            Dim lblTaskName = CType(e.Item.FindControl("lblTaskName"), Label)

            lblTaskId.Text = CType(t.taskId, String)

            lblTaskName.Text = t.taskName

            Dim time = (If(t.taskDueTime Is Nothing, New TimeSpan(0, 23, 59, 59), TimeSpan.Parse(t.taskDueTime)))
            Dim dueDateTime As DateTime = (Occasion.started.Date + time)

            'Setup up due DateTime for Daily Tasks
            Select Case DirectCast(t.taskDayTypeId, helpers.Constants.enDayType)
                Case helpers.Constants.enDayType.Daily
                    lblDueDate.Text = dueDateTime.ToString("dd/MM/yyyy HH:mm")
                    Exit Select
                Case Else
                    'Calculate the actual due date for non-daily tasks
                    Dim calculator = New Calculator()
                    Dim calId = t.taskCalendarId
                    Dim taskMonthDay = "1"
                    If Not t.taskMonthDayId Is Nothing Then
                        taskMonthDay = CType(t.taskMonthDayId, String)
                    End If
                    Dim monthDay = _db.MonthDays.First(Function(m) m.id = CInt(taskMonthDay))
                    Dim calendar As Model.Calendar = Nothing
                    If Not calId is Nothing Then
                        calendar = _db.Calendars.First(Function(x) calId.Value = x.id)
                    End If
                    Dim potDate = calculator.GetActualDueDate(dueDateTime, monthDay.monthDay, t, calendar)
                    dueDateTime = (potDate.Date + time)
                    lblDueDate.Text = dueDateTime.ToString("dd/MM/yyyy HH:mm")
                    Exit Select
            End Select

Therefore once the data is displayed in the repeater, some of the 'Tasks' are not in the correct order because the due date can be recalculated to a date prior to it's 'duedate' that is stored on the database.

What I have tried:

I need to be able to sort the data after the due date re-calculation. How is this possible?

Thanks