Validaion Controls

I generate a table on the fly in my page. For each row i have a radiobutton so the user can select an item on the table to view.

How can i add a validation control to check whether the user has selected a row in my table.

Currently i validate the control when the user hits the view button but when the button is click the tables data is not reloaded cos of the postback, maybe i should cache that?

VB Code:

While (l_e.MoveNext = True)
                    l_order = CType(l_e.Current, Order)
                    Dim detailsRow As TableRow = New TableRow
 
                    Dim l_cellSelect As New TableCell
                    Dim l_selector As New RadioButton
                    l_selector.ID = l_order.OrderHeader.OrderHeaderId.ToString
                    l_selector.GroupName = ORDER_SELECTION
                    l_cellSelect.Controls.Add(l_selector)
                    detailsRow.Cells.Add(l_cellSelect)
 
                    Dim l_nameCell As TableCell = New TableCell
                    l_nameCell.Text = l_order.Customer.CustomerName
                    detailsRow.Cells.Add(l_nameCell)
 
                    Dim l_dispatchCell As TableCell = New TableCell
                    l_dispatchCell.Text = l_order.OrderHeader.DispatchNo.ToString
                    detailsRow.Cells.Add(l_dispatchCell)
 
                    Dim l_poNoCell As TableCell = New TableCell
                    l_poNoCell.Text = l_order.OrderHeader.CustPONo
                    detailsRow.Cells.Add(l_poNoCell)
 
                    Dim l_poDateCell As TableCell = New TableCell
                    l_poDateCell.Text = l_order.OrderHeader.CustPODate.ToString("dd/MM/yyyy")
                    detailsRow.Cells.Add(l_poDateCell)
 
                    'Add the new row to the table.
                    tblOrders.Rows.Add(detailsRow)
                End While

could you not store the DataTable in a session variable?

yes i could store the array of order objects in a session, but for performance reasons im trying to keep sessions to a minimum...

but if i could get the validation field working for the selection it would be less overhead

can you add a validator on the fly to the selection or is what im trying to do hard

I'm pretty sure you can add any kind of control on the fly. May not be very consistent though. Besides the session variable is held server-side so if the page is doing a postback anyway the performance difference should be negligible. Try using the trace before and after declaring a postback just to check :thumb: