Block Con Command

I would like to be able to block access to a console command, how would I go about doing this?

[lua]
function BlockCommand()
return false end
end
concommand.Add(“ThisCommandIsBlocked”, BlockedCommand)
[/lua]

zzaacckk, that’s an unreliable method as the client can just add their command after you’ve blocked it.

And it even got an error

Take a look at gm_sourcenet - http://code.google.com/p/chrisaster/source/browse/trunk/gm_sourcenet/Release/gm_sourcenet.dll
or gm_slog - http://gmodmodules.googlecode.com/svn/trunk/gm_slog/Release/gm_slog.dll