Network Monitor - not remove the listview

Good morning friends

I write from Brazil, and I need help from an expert .(..
I am developing the program attached with another program on existing

This is very important to me as it is for my college training ..

basically I track IP address through ICMP. The problem is the following:

add options in the form of Ip and description for the monitoring after these will add to the listview on the form and ping works
the problem is when I try to remove an address in the form options it should also delete the form ping ... this is my problem ....

please help me .. do I need to deliver soon and I can not solve this ...

Thank you very much