Trying to find ClientID of web form

[Neo Geshel]

I need to get the ClientID of a form field for some JavaScript. About
25+ web sites I visited recommend the following method for finding the
client ID of a web form:

Web Form -> <asp:TextBox ID="datefield" type="hidden" Runat="Server" />
Client ID -> <%= datefield.ClientID() %>

Unfortunately, this only provides the following error:

Compilation Error
Compiler Error Message: BC30451: Name 'datefield' is not declared.
Source Error:
Line 200:
Line 201:
Line 202:<%= datefield.ClientID() %>
Line 203:
Line 204:

Why does this throw an error on my page? IF this is wrong, why did the
other 25+ MVP's (who recommended this method) also get it wrong?

Also, how does one make an <asp:TextBox /> invisible on the web page?
Using a Type="hidden" doesn't seem to do the trick (it is still visible).

TIA
....Geshel
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[Brock Allen]

Client ID is a property not a method. Drop the "()" after you call to "datefield.ClientID()"