Extension of B2 : Query

[suppp]

I have a query on the extension of a B2 Visa. The website mentions that if the application for extension is denied, the visa is revoked.
Is that true?
If I apply for an extension of B2 visa and that request is denied, does that mean my original visa is now void? Can someone please clarify?

[immihelp]

Yes, that is true. This has been discussed many times on this discussion forum in past.

[cone]

B2 visa extension denied

Yes, that is true. This has been discussed many times on this discussion forum in past.

HOW TO KNOW the information of visa void .Pl.suggest to avoid deportation when we reenter after some years.The reply to a thread on staying till receip[t of rejection in the same page is confusing.Thanks