Hi Sivaprakash,
Yes, in the KonaKart Admin App up to and including the 2.2.0.6 release, the browser refresh will reload the admin app into the browser and force you to login again as it deliberately clears the state. It's designed so that you shouldn't need to hit the refresh button, unless perhaps you need to load a new version of the admin app.
However, in the next release there are some changes in this area. In KonaKart Admin App v 2.2.0.7, after the browser refresh is clicked, the user will return to the page they were on prior to the refesh. The Admin App uses cookies for this information so it'll only work if cookies are enabled.
A much more significant change in the 2.2.0.7 release is the new role-based security for the Admin App. This should be available later this week. For news of this and notification of all new releases, ensure you register for the forum newsletter - a mail is sent out when new releases become available.
Julie