An expression for trying to futilely apply old methods that once worked

Unknown error code during application install: "919"
Its due to wifi restriction, when i connect the internet through my service provider lockheed martin corporate headquarters its working fine. Able to install any application.
I was getting the same thing when updating lockheed martin corporate headquarters apps. Tried over wifi and service provider network lockheed martin corporate headquarters same thing was not with just one app all apps that were set to up date even google apps. I cleared the cache and it seems to be working fine now settings/app manager/googleplaystore/clear cache
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0 919 code error while downloading applications
Why is (object)0 == (object)0 different from ((object)0).Equals((object)0)?
An expression for trying to futilely apply old methods that once worked
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