Parser Error: The 'Text' property of 'asp:TextBox' does not allow child objects.

[sruthi manduva]

hi,
in my ASP.net page I am using the following

<asp:RequiredFieldValidator runat="server" ErrorMessage="Item Name cannot be blank" ControlToValidate ="txtitmname"></asp:RequiredFieldValidator>

This is my code

<asp:Panel runat="server" ID="panel1" CssClass="modalPopup" align="center" style ="display:none"> <div class="header">
Add New Item
</div> <br /> <asp:Label runat="server" Text=" Enter Item Name"></asp:Label><br /> <asp:TextBox runat="server" ID="txtitmname"> <asp:RequiredFieldValidator runat="server" ErrorMessage="Item Name cannot be blank" ControlToValidate ="txtitmname"></asp:RequiredFieldValidator></asp:TextBox><br /><br /> <asp:Button runat="server" ID="btnok" Text="Ok" onclick="btnok_Click"> </asp:Button> <asp:Button runat="server" ID="btncancel" Text="Cancel"></asp:Button> </asp:Panel>

but it gives me this error
The 'Text' property of 'asp:TextBox' does not allow child objects.

Please let me know how to resolve this.
Thanks