I cannot find a proper way to do this can someone help

[C# Programming]

I want to assign 10 threads (it could be n) to a listview of (10000 records).

The listview's first coloumn is email. So I want to send email to a method and get a return string as a result (valid or not). which i want to add to the second column of the listview. Pls help me how to do it?

Code would be much appriciated.