[Solved] iAd issue:–> Every time empty iAd banners is coming instead of AdMobView

first of all be clear about iad or admob , that are two different plateform for displaing adv in your app.
i think you are try to integrate admob adv. you need to following steps for it.

http://www.edumobile.org/iphone/iphone-programming-tutorials/how-to-admob-integrate-in-your-application-in-iphone/