reminder function at every 1 second in Global.asax

In asp.net applications the timers will go break like this:

For getting an infinite callback on your methods you should use Caching and Expiry logics.
The idea is that you create an item in the cache and on expiry you set a method to be called.
You can set the cache expiry time to 1 minute and on the callback method you have to 
create the cache again.  In this way your method will get called as long as the webserver is online.

I am using this way to achieve daily data updations for my website.
http://www.codeproject.com/KB/aspnet/ASPNETService.aspx?msg=3756781#xx3756781xx