how to put country restriction on dolphin?

I want to know if there is a way to block some countries so they won't be able to access my website. Is it got to do some thing with .htacess file ? 

See this

http://www.boonex.com/forums/?action=goto&search=1#topic/How-To-Block-The-Entire-Planet-From-Joining-Your-Site-well-almost.htm

You can block countries with build-in tools:

Go to Admin Panel -> Tools -> Antispam Tools -> Settings:

Turn on "Enable DNS Block Lists" setting.

Then go to Admin Panel -> Tools -> Antispam Tools -> DNS Blocklists -> click "Add":

Chain: spammers

Domain zone: XX.countries.nerd.dk. XX is country code, for example to block China, replace XX with cn, all country codes can be found here. 

Return value: 127.0.0.2

URL: http://countries.nerd.dk/

Recheck URL: leave empty, there is no recheck url for this DNSBL

Comment: your comment, for example full country name

Active: YES or NO

It is also possible to whitelist some countries and block all others, here is an example on how to do this:

http://www.boonex.com/forums/topic/How-To-Ban-Countries.htm#158297

Thanks both of you :)