Auto Close question after First answer

Question

How can i Auto Close question after First answer

Or better

Only the question Starter and  the First  answerer has Access to post on the question

Thanks

Comments

I suppose you would need a small plugin -(event module) to do this. See for q_post event and then close the question.

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I know , but I need the complete code , I'm not good in php

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It is a very specific requirement- don't think any one will be doing this for free.