Possible Duplicates:
Should I ask a question I know the answer to?
Should I not answer my own questions?
I have posted a question, and then later I found the mistake and solution by myself. Can I give this as the answer to my own question? If I give that answer, what will happen?
already knowing the answer and asking a question to share what you know
andasking a question without any answers while you keep looking for an answer by yourself, too
.