How to stop Thread.Wait

Thead.Wait can't be stop easily, you need to use an alternative solution, by using
ManualResetEvent

ManualResetEvent mre=new ManualResetEvent(false);
//......
var signalled=mre.WaitOne(TimeSpan.FromSeconds(8));
if(signalled)
{
    //cancel the event
}

elsewhere (before the 8 seconds is up):

mre.Set(); //unfreezes paused Thread and causes signalled==true

and allow the unblocked thread to terminate gracefully. Thread.Abort is evil and should be avoided.

Once  mre.Set(), mre.WaitOne(TimeSpan.FromSeconds(8)); mre always return a signal, you need to "unset" the ManualResetEvent by

mre.Reset()

Source