Bismillah

Assalamu alaikum,

1) If a person raises his hands before or after Ruku, will not invalidate the salah or make it Makrooh but the salah would remain correct and complete.

2) Proofs of not raising the hands.

Mahmud Bin Ghailaan al-Marwazi - Wakee’ - Sufyaan - Aasim Bin Kulaib - Abdur Rahmaan Bin al-Aswad - Alqamah - Abdullah (Bin Mas’ood): “Verily he said:
‘Should I not perform with you the Salaat of Rasulullah (Sall Allahu alaihi wa Aalihi wa Sallim)?’

He then performed Salaat and he did not raise his hands except once.”

(Nasaai)

Similarly, there are 42 Sahih evidences for the issue of not raising the hands in the Hanafi Madhhab.

Please View this link to find out more: http://www.ummah.net/Al_adaab/fiqh/raf_al_yadain.html

And Only Allah Ta'ala Knows Best.