Kindly tell me what is the concept of istikhara in Islam? Mention any strong and valid quranic references or hadith references

Hello Samanzaheer,

Open the links below it you may find your answer, Thanks.

Before any major decision, pray Salat-ul-Istikhara | The Islamic Workplace (http://theislamicworkplace.com/2006/12/25/before-any-major-decision-pray-salat-ul-istikhara/)

Q & A: Confused: My Marriages Failed Despite Istikhara (http://www.albalagh.net/qa/istikharah_marriage.shtml)

Thank you very much!