Zikr & Dua

Durood-e-Roohi

Q: Is Durood-e-Roohi (darood e qabristan) authentic? My mother passed away and I recited this durood daily but now some other person told me that this is not authenticate and don't do it.

Conditions for one's duas being accepted

Q: I would like to know, sometimes our duas are not accepted by Allah, we don't get solutions for our problems, even after doing lot of dua. Is there any particular method in asking for dua, or is it because of the sins performed in the past knowingly or unknowingly? I know nothing will happen to our wish, but still is there any particular thing to be done, so that our halal duas get accepted?