Get data from page to know how many dynamic controls to load to grab values

[lleemon]

I currently have a page that has 2 panels. First panel has a textbox and a button, second panel has 3 textbox and a button but this panel is not visible intially.

On load, the user needs to enter a unique code and click the button. On first panel submit, if code is valid, hide the first panel and show second panel which has the three textbox, submit button and a placeholder control.

In the admin of my site, we can identify for each client if they need to ask additional questions to get more info from their users. Some have none some have 1 or 2+ questions. End result, can have 0 to many questions.

So back on my form, for each question for that client, I am creating a textbox in the second panel placehoder control.

My problem is on submit of second panel, to capture the data of these dynamic controls, I can't get my controls to reload because loading the controls requires dynamic data of a code. I can get dynamic controls to work if I have a hard coded value and loop through to recreate. But pulling from the database I can't seem to get to work because on initialize I can't grab the unique code from the form. That unique code determines what client to associate with, which determines how many textbox controls to create/read.

Is there a better way handling creating dynamic controls based on a value stored/entered in the same page set textbox control?

<asp:Panel ID="pnlAccessCode" runat="server">
    <fieldset class="access-code-form">
        <legend></legend> 
        <div>
            <label for="txtAccessCode" class="required">Access Code</label> <asp:TextBox ID="txtAccessCode" ToolTip="Access Code" 
                runat="server" MaxLength="100" />
       </div>
       <div>
            <label for="btnACRegister">&nbsp;</label>
            <asp:Button ID="btnACRegister" runat="server" Text="Register" />
       </div>

     </fieldset>
</asp:Panel>

<asp:Panel ID="pnlInfo" runat="server" Visible="false">
    <fieldset>
        <legend></legend>
        <div>
            <label for="txtEmail" class="required">Email</label> <asp:TextBox ID="txtEmail" ToolTip="Email" 
                runat="server" MaxLength="150" />
       </div>

       <asp:PlaceHolder ID="phNewLabels" runat="server"></asp:PlaceHolder>
       <asp:Literal ID="litLabelIDs" runat="server" Visible="false" />
       <div>
            <label for="btnRegister"></label>
            <asp:Button ID="btnRegister" runat="server" Text="Register" />
       </div>
    </fieldset>
</asp:Panel>

Private Sub CreateDynamicControls()
        phNewLabels.Controls.Clear()

        Dim oFunc As clsFunctions = New clsFunctions
        If txtAccessCode.Text.Trim.Length > 0 Then
            Dim ds As DataSet = oFunc.GetAddlFields(txtAccessCode.Text.Trim)
            Dim dv As DataView = New DataView(ds.Tables(0))

            For Each drv As DataRowView In dv

                Dim iFieldID As Integer = drv("wpt_subscription_addl_field_id")
                Dim sFieldLabel As String = drv("wpt_subscription_addl_field_label")
                Dim iIsRequired As Integer = drv("wpt_subscription_addl_field_isreq")
                litLabelIDs.Text &= iFieldID.ToString & ","

                Dim sRequired As String = ""
                Dim rv As RequiredFieldValidator = New RequiredFieldValidator

                If iIsRequired = 1 Then
                    sRequired = "class=""required"""

                    rv.ID = "rfv" & iFieldID
                    rv.ControlToValidate = "txtTextBox" & iFieldID
                    rv.ErrorMessage = " Required!"
                    'rv.InitialValue = "*"

                End If

                Dim gcDivBlock As HtmlGenericControl = New HtmlGenericControl("div")
                gcDivBlock.ID = "AddlField" & iFieldID

                Dim litLiteral = New Literal
                litLiteral.Text = String.Format("<label for=""{0}"" {2}>{1}</label>", "txtTextBox" & iFieldID, sFieldLabel, sRequired)
                litLiteral.ID = "litLiteral" & iFieldID

                Dim txtTextBox As TextBox = New TextBox
                txtTextBox.Text = ""
                txtTextBox.ID = "txtTextBox" & iFieldID


                gcDivBlock.Controls.Add(litLiteral)
                gcDivBlock.Controls.Add(txtTextBox)
                If iIsRequired = 1 Then
                    gcDivBlock.Controls.Add(rv)
                End If
                phNewLabels.Controls.Add(gcDivBlock)
            Next

            If litLabelIDs.Text.EndsWith(",") Then
                litLabelIDs.Text = litLabelIDs.Text.Substring(0, litLabelIDs.Text.Length - 1)
            End If
        End If
    End Sub

 Protected Sub btnACRegister_Click(sender As Object, e As System.EventArgs) Handles btnACRegister.Click
        If txtAccessCode.Text.Trim.Length > 0 Then
            CreateDynamicControls()
        End If
    End Sub

    Protected Sub btnRegister_Click(sender As Object, e As System.EventArgs) Handles btnRegister.Click
            Dim sIDs() As String = litLabelIDs.Text.Split(",")
            For Each iID As Integer In sIDs
                Dim txtBox As TextBox = phNewLabels.FindControl("txtTextBox" & iID)
                lblMsg.Text &= txtBox.Text & ","
            Next
    End Sub

    Protected Sub Page_Init(sender As Object, e As System.EventArgs) Handles Me.Init
        CreateDynamicControls()
    End Sub