Okay, I found a solution to this one also. There's a
DotNetNuke.Framework.ProviderConfiguration
class, that can help you to retrieve configuration items set in web.config.
Use its GetProviderConfiguration method, & Providers property to get access to any desired Provider & its configuration. Also, remember that GetProviderConfiguration requires the type of Provder (profiles, data, membership etc.) which you are looking out for!!!