The very bad question How to use Obfuscation in C# Code was deleted by Joel while we were in the process of finding out what the poster was asking.
Why so quick? We didn't even give him a chance to realize what it was that he didn't understand.
The OP was clearly not a native English speaker (profile says he's from Iran), and may not even have ever seen the word "obfuscate" written down. He was no doubt sounding out the word he thought he had heard. He was actively engaged in the process of understanding what question to ask.
He even thought he as asking about a "luck" file!
As I see it, if the question hadn't been deleted, it would have taken less than another 15 minutes to get the OP to realize that he had heard wrong. We would then have asked him to state his question in simpler terms. This would have brought out the fact (perhaps) that he was looking for how to do software licensing, or whatever it is that he wanted. Now, the OP probably has no idea at all what the problem with his question was.
I can see doing this for posters who don't engage with the community to learn how to ask their questions. I close those questions pretty fast, and delete them even faster. But in this case, the OP was actually making an attempt, and he should have been permitted to continue.