I have a addhandler that controls the events of a dropdownlist that is being built on the fly.  There could be one DDL ro multiple depending on what is returned from the DB.  When the user selects one of the three options in the DDL, then the results will create either a TxtBox or another DDL.

The issue that I am having is that if I have 3 DDL's and the user selects something from the first one, it hits the addhandler sub routine, and it creates either a txtbox or ddl. It reloads the page with the new control.  Here is where it gets tricky....if the user selects something with in the second DDL and it hits the addhandler again..only this time when it reloads the page it doesn't keep the first control that is built, it removes it and builds the new control. 

I'm puzzled on how I can keep each control that is built on the page? If you notice below, the user can change each one of the Function DDL's and in turn each one should build its own Value txtbox or ddl.  It does build the new control but I can't keep the previous control that was built.

Form Layout:

tr.Cells.Add(CreateDropDownListCell(ddlFunction, "ddlFunction" & strText, , 85, Css.Style.DefaultText))

'Create AddHandler for ddlFunction
AddHandler ddlFunction.SelectedIndexChanged, AddressOf ProcessDDLFunction

'Display Label name for TextBox
tr.Cells.Add(CreateTextCell("Value:", Css.Style.DefaultTextBold, , False, HorizontalAlign.Right))

'Display the Value field, either textbox or dropdown
strTRID = Right(tr.ID, 8)
strCurLotNum = CType(Session("strLotNum"), String)

If strTRID = CType(Session("strLotNum"), String) And CType(ddlFunction.SelectedIndex, String) <> CType(Session("strIndex"), String) Then
   If strText = strCurLotNum Then
      tr.Cells.Add(CType(Session("tcXCell"), TableCell))
   End If
End If

tblMain.Rows.Add(tr)

CODE (Sub Routine for AddHandler, where new control is being built):
'dllFunction = NONE, create TextBox(txtValue) default to ZERO
If CType(sender, DropDownList).SelectedIndex = 1 Then
   txtValue = New TextBox
   txtValue.AutoPostBack = False   
   tcXCell = CreateTextBoxCell(txtValue, "txtValue" & Right(CType(sender, DropDownList).ID, 8), "0", , 60, , Css.Style.DefaultText)
   Session("tcXCell") = tcXCell
ElseIf CType(sender, DropDownList).SelectedIndex = 2 Then

   'dllFunction = NONE, create TextBox(txtValue) default to blank
   txtValue = New TextBox
   txtValue.AutoPostBack = False
   tcXCell = CreateTextBoxCell(txtValue, "txtValue" & Right(CType(sender, DropDownList).ID, 8), , , 60, , Css.Style.DefaultText)
   Session("tcXCell") = tcXCell
ElseIf CType(sender, DropDownList).SelectedIndex = 3 Then
   'dllFunction = ALWAYS, create DropDown List with default values    
   ddlValue = New DropDownList
   ddlValue.AutoPostBack = False
   tcXCell = CreateDropDownListCell(ddlValue, "ddlValue" & Right(CType(sender, DropDownList).ID, 8), , 85, Css.Style.DefaultText)
   Session("tcXCell") = tcXCell   
End If

Session("strIndex") = CType(sender, DropDownList).SelectedIndex
strLotNum = Right(CType(sender, DropDownList).ID, 8)
Session("strLotNum") = strLotNum

 Thanks in advance for any help!

Adrian

Private Sub ProcessDDLFunction(ByVal sender As Object, ByVal e As System.EventArgs)
Dim strLotNum As String
Dim aryNewCntrls As ArrayList
Dim i As Integer

'Current Lot Number
strLotNum = Right(CType(sender, DropDownList).ID, 8)

If arydynamicControls Is Nothing Then
   arydynamicControls = New ArrayList
Else
   'Retrieve DynamicControls ArrayList
   arydynamicControls = CType(Session("aryDynamicControls"), ArrayList)
End If

'dllFunction = NONE, create TextBox(txtValue) default to ZERO
If CType(sender, DropDownList).SelectedIndex = 1 Then
   arydynamicControls.Add(strLotNum & "to")
ElseIf CType(sender, DropDownList).SelectedIndex = 2 Then
   arydynamicControls.Add(strLotNum & "tb")
ElseIf CType(sender, DropDownList).SelectedIndex = 3 Then
   arydynamicControls.Add(strLotNum & "dl")
End If

Session("aryDynamicControls") = arydynamicControls
Session("blnDDLFlag") = True

End Sub