How add a CheckBox in my table

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VB

I have that code for fill my table:

Dim TBLRow As New TableRow
       Dim TBLCell As New TableCell

       If DistinctSubAssy.Rows.Count > 0 Then
           For a = 0 To DistinctSubAssy.Rows.Count - 1

               ' Afli prima denumire
               Dim SubAssy As String = DistinctSubAssy(a).SubAssy
               Dim GetRowSpanForThisSubAssy As Integer = Adapter.DistinctProductType(SelectedCategory, SubAssy)
               Dim DistinctProductType As MV_SamplesOrders.SelectionsDataTable = Adapter.GetDistinctProductType(SelectedCategory, SubAssy)

               TBLCell = New TableCell
               TBLCell.RowSpan = GetRowSpanForThisSubAssy
               TBLCell.Text = SubAssy
               TBLRow.Cells.Add(TBLCell)

               For b = 0 To DistinctProductType.Rows.Count - 1
                   Dim ProductType As String = DistinctProductType(b).ProductType
                   Dim GetSelection As MV_SamplesOrders.SelectionsDataTable = Adapter.GetDataByCategoryAndSubAssyAndProductType(SelectedCategory, SubAssy, ProductType)

                   TBLCell = New TableCell
                   TBLCell.Text = ProductType
                   TBLRow.Cells.Add(TBLCell)


                   TBLCell = New TableCell
                   For c = 0 To GetSelection.Rows.Count - 1
                       Dim Selection As String = GetSelection(c).Selection
                       Dim SelectControlPlan As String = GetSelection(c).ControlType

                       TBLCell.Controls.Add(New LiteralControl(Selection))
                       '----------------HERE------------
                       TBLCell.Controls.Add(New LiteralControl("<br />"))
                       TBLRow.Cells.Add(TBLCell)

                   Next

                   TBL_Selections.Rows.Add(TBLRow)
                   TBLRow = New TableRow

               Next
           Next
       End If

Where is comm '----------------HERE------------ i want to insert a checkbox but how?
A CheckBox for every value of my table.

Thanks a lot