Multiple IP Address Pings at Once Fast


I have created text file as follows.,Up,Down,Up,Down,Up,Down,Up,Down,Up,Down,Up,Down,Up,Down,Up,Down

I have created Windows Application in C#. In that, i have placed one timer control.On Timer Tick, i need to get all ip addresses from text file and ping at one fast and update status of all ip addresses in same text file.
It is urgent.
Can you plesase provide me the solution?
Thanks in Advance.