About Dargah mannat

Is it true that if we ask any mannat in dargah it fulfills?

there is a secret behind the mannat system, which u will find in the answer below, If you have faith in Gareeb nawaz, dont ask any question, just make a wish right now even without coming to dargah,but do take a vow that you will be coming to mukkunda once the wish gets fulfilled. its one of the most revered Dargah in the world, and i have been to this dargah many times, although I never tried testing that the Mannat gets fulfilled or not, but I feel that whenever i visit this place at least i get a sense of Calm, the difficulties melt away. 
people who believe in this Mannat system told me a secret that there is a time called as “Roshni”, in the vening, during this time only males are allowed in dargah, it is said that if you can make your way to the mazar at thjis time & make a wish ,(and if that wish is a legal one(that can be fulfilled)), then you are supposed to get it. 

Even if you don’t manage to reach or visit Dargah at Roshini time don’t worry .. tie a Mannat ka Dhaga anywhere in the premise .. make a wish .. and take a vow that when your wish would be fulfilled you will visit Dargah again .. and when you visit again do not forget to untie your Mannat ka dargah .. plz don’t try to find the one you tied :-) just untie anyone of the dargah .. 
I wish that it helps and your mannat gets fulfilled.