Height time of this error during publishing website

Jan 30 2012 2:13 AM

I have one hiddenfield as

<asp:HiddenField ID ="Hdgrd" runat ="server" />

I am not getting what is wrong in this..............

I am getting error Hdgrd is not declared when i am trying to do publish website

This issue I have faced before but it was solved after restarting Visual studio.....but this time even after restarting machine it is not getting solved