Re: This program is not thread safe and cause run time error in debug mode

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So because of that I assume that the thread handling must be different
between debug mode and release mode?
Yes; there is a debug assistant that detects this; there is also a
static property that can tweak this behavior (I suggest setting it to
*true*): http://msdn2.microsoft.com/en-us/library/system.windows.forms.control.checkforillegalcrossthreadcalls.aspx

2.Is it always advisable to fix run time error of the kind that I have in
this program?
Yes; you have a bug

3. My third question is how do I fix the program with the same
functionallity
which mean that I can subscribe to the event and unsubscribe to the event
without causing
run time error?

I'd need to look at it in debug (no time at this second), but normally
the answer is to (in any UI handler that is going to be fired by a non-
UI thread) use InvokeRequired / BeginInvoke / Invoke to pass control
to the UI thread. You can also use the sync-context. I'll see if I can
have a look later...

Marc
.

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