I noticed this comment and am not sure I understand the logic behind it.
In the future, if you intend to answer your own question, please write up the answer beforehand. When asking the question, you'll be able to tick a box stating "Answer your own question".
What is the difference between answering at the same time as asking and giving an answer after the question is posted? Why would immediate be preferred?
A summary of the issue, since this seems to be confusing to people:
Speaking specifically about the case where you already know the answer and are planning to answer before you ask the question, some people feel like you should go ahead and post the answer with the question using the little checkbox on the "ask a new question" page.
This is not a requirement, merely a suggestion that some feel saves the time of potential answerers. I'm personally not going to punish anyone (ie, downvote, comment, suspend, delete, etc) for answering after a short while.
More info follows:
This is a somewhat contentious issue (see this discussion on MSO, for example). It's been complicated further because the system changed to explicitly allow this situation after some of these discussions occurred. (Some folks would rather the asker not be able to do this at all, from reading some of these MSO threads...)
If you're planning on answering the question, you can save other answerer's time by posting the answer and the question in one swoop. However, you may discourage answers that might be better than yours by doing so.
There's some risk that if you wait your answer will be redundant with respect to other answers on the question. Thus, your answer might look like you're stealing theirs, even if you wrote it first.
I wouldn't say it's a requirement that you post the question and answer at the same time, but I would say that it's probably a good idea.
With my moderator hat on, I personally will not take any action if people decide to ask a question and answer it a few minutes later without using the checkbox. I will not leave a comment, a downvote, delete, or suspend, or take any other punitive action. The community may downvote or comment, however.
Personally, even when I intend to answer my own question, I will do what you did and post the question first. I generally leave 15-60 minutes for the question to attract any other potential answers before re-evaluating if I need to post my own answer.
The reason I do this, is to promote other people answering questions. Other people will potentially have alternative or better methods of achieving the end goal and it is of value to the site to have multiple answers per question (provided they're not identical answers) so that the system of upvoting the best answer to the top can actually work.
While many people would prefer you to post them in one go (or, in some cases, not answer your own questions at all!) it's up to you how you handle it.
Be warned however, if you choose to wait before answering your own question and somebody posts basically the same answer that you were going to post, that there probably isn't a need for your answer anymore. In these instances, I determine if what I was going to post is actually an improvement over what was posted (easier to read, screenshots detailing how to undertake said task, etc) and if not, I won't post an additional answer.
