my asp.net application has two forms. first one is to input the ip address from user.at the second form shows it response as a table and home button (navigate to the first form).at the first time when i run this application it takes 3 minutes to ping with that ip address and displays response. then i pressed home button.Now i entered the ipaddress for the first form, now it takes only 5 seconds. Why this happens? and how to resolve this?