vb.net - Recognizing new or already known document with VSTO -

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i've never worked vsto , i've read kinds of stuff it. ask theoretical question. i'm trying make addin should (using buttons in it's own ribbon tab) upload document website (it's slideshare). problem file may uploaded , user may trying update it.

so need way tell if file has been uploaded. know prediction can't 100% accurate, that's why i'm going ask user dialog, need clever alert user if file may uploaded.

this assumption can client-side only, database of sort (in addin itself). thought of recording file's name , based on can decide if file new or it's uploaded.

do have other ideas? maybe there's more clever way this?

ps. working on office 2010 latest version of vsto in vs 2010. main .net language vb samples in c# more welcome (if have ones).

what i'd in case add document variable or document property value of guid.

then when push file, server extract property, guid , perform lookup see if doc there.

at least, that'd way (other say, user , filename) id document.


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