asp.net query for servername...(Urgent plz)

Hi frinds I have two radio buttons called server1 and server2 on the screen and with that i have one textbox called loggingid..

my question is if user select the server1 raido button he need to enter his loggindid i am gong to validate his loggindid using webservices and I will check

for same thing if user select the server2 I need to validate again..

Now I need that how I need to query to findout out which server is which.. and how to check that user clicked server1 or server2..

do we need anything like servername to query this?

Thanks for your time

 
...