User1283497924 posted
Hi,
Plz check the code:
<asp:Label
ID="lbl_Name"
runat="server" AssociatedControlID="txt_Name_text"
Text="Name"></asp:Label>
<asp:Label
ID="txt_Name_text"
runat="server"
Visible="false"></asp:Label>
<telerik:RadTextBox
ID="txt_Name"
runat="server">
</telerik:RadTextBox>
for more detail plz refer the link
http://www.telerik.com/community/forums/aspnet/input/radtextbox-with-associatedcontrolid.aspx
http://www.telerik.com/support/kb/aspnet-ajax/input/standard-compliant-radinput-and-raddatetimepicker-with-no-tables.aspx