In my application I need to have one link which is directly conncect to the app store and it is the link of my application on iTunes App Store. Can anyone please let me know how to do it?
When you add the app to iTunes Connect, it gets an Apple ID (a 9 or 10 digit number). You can use a URL of the form http://itunes.apple.com/app/id<your_id>
to link to your app in the store, for example http://itunes.apple.com/app/id417817520 if your Apple ID was 417817520.
The link will only work after the app has been approved of course.