>>Paul, unfortunately your suggestion doesn't work. When I entered cUserId = Me.Page.RoundPanel1.FindControl("HIddenField1").UniqueId, I got the squiggly blue line under it and when I hovered the mouse over it, it said that RoundPanel1 is not a member of class Page. This is so frustrating! Everything I try fails. It shouldn't be this difficult, should it?
>
>It sounds like it may be nested inside of other controls. If that's the case, you may not actually be able to refer to it directly from the code behind w/o calling FindControl of the container object. For example, if your RoundPanel1 is inside of some other section of another control. Post a small section of your ASP.NET page here up to where the HiddenField1 is.

OK, I'll try that. I will elipse certain code to keep it as brief as possible. I use MasterPages on my site. I don't know if that makes a difference. I hasn't for other things. So...

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    
    <table id="MainTable" style="border:none; background-color:#F0F8FF">
        <tr id="TableRow1" style="border:none">
            <td id="TableCell1" colspan="2" style="border:none; height:2px"></td>
        </tr>
        <tr id="TableRow2" style="border:none">
            <td id="TableCell2" style="border:none; width:850px; vertical-align:top">
                <dxrp:ASPxRoundPanel ID="ASPxRoundPanel1" runat="server" 
                    CssFilePath="~/App_Themes/Blue/BlueStyles.css" CssPostfix="Blue" BackColor="White"
                    Width="850px" HeaderText="My Dana's 3D Profile" HeaderStyle-Font-Bold="true">
                    ...
                    ' code that defines the style, color, etc. of the panel
                    ...
                       <PanelCollection>
                            
                            <dxp:panelcontent id="dataPanelContent" runat="server">
                                <table id="profileTable" style="border:none; width:100%">
                                    <tr id="linksRow" style="border:none">
                                        <td id="pwLinkCell" style="border:none; width: 145px;" align="left">
                                            <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl="~/Danas3D/ChangeMyPassword.aspx"
                                                Width="142px">Change my Password</asp:HyperLink>
                                        </td>
                                        <td id="emLinkCell" style="border:none" align="left">
                                        </td>
                                    </tr>
                                    <tr id="userDataRow" style="border:none">
                                        <td id="udCell" style="border:none" colspan="2" align="left">
                                            <br /><br />
                                            <asp:GridView ID="ProfileGridview" runat="server" BorderStyle="None" CellPadding="2"
                                                ShowHeader="False" Font-Size="9pt">
                                            </asp:GridView>
                                            <br />
                                            <hr />
                                            <table id="profileData" style="border:none; width:100%">
                                                <tr id="userIdRow" style="border:none">
                                                    <td id="userIDCell" style="border:none" colspan="2">
                                                        <asp:HiddenField ID="HiddenField1" runat="server" />
                                                    </td>
                                                </tr>
                                                <tr id="fnRow" style="border:none">
                                                    <td id="fnLabel" style="border:none; padding-right:2px; width: 127px;" align="right">
                                                        <asp:Label ID="lblFN" runat="server" Text="First Name:" Font-Bold="True"></asp:Label>
                                                    </td>
                                                    <td id="fnData" style="border:none; padding-left:2px" align="left">
                                                        <asp:TextBox ID="TextFirstName" runat="server" MaxLength="50" Enabled="False" Width="366px" AutoCompleteType="FirstName"></asp:TextBox>
                                                        <asp:RequiredFieldValidator runat="server" ID="FirstNameValidator" SetFocusOnError="True" ControlToValidate="TextFirstName" ErrorMessage="First Name is required!" ToolTip="First Name is required" ValidationGroup="ProfileDataValidator">*</asp:RequiredFieldValidator>
                                                    </td>
                                                </tr>

I included code up to the first data entry field after the hidden field. The GridView you see has data bound to it in the code behind after a call to a stored procedure. It presents data that is not editable. I got the same errors when I didn't have the hidden field, they just started with the first name textbox instead.

Note that I am using a regular table not a asp:Table. It is for layout only.

Thanks for taking the time with me.
Dana