Need to add objects to array without creating duplicates

I am building a RFID inventory project.  I need to track RFID tags passing several antenna's.  RFID tags will be read several times approx 40+ times as they pass an antenna.  I need to be able to build an object with various information from the RFID read without it duplicating tag information so that I can add it to a database without causing duplicate entries and/or un needed database access.  In the perl world I would just assign a tag to say $rfid{$tagid} = "something" which would keep duplicates from being an issue using a HASH.  Is there something similar that can be done in C# or even a better way?

A bit of code would be most desirable but at least a link to some useful information would be greatly appreciated.
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Tekati68Information Technology DirectorAsked:
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Anurag ThakurTechnical ManagerCommented:
You can use an List <T> for that
In a list you can use the contains to see whether the value exists or not by .Contains()

MSDN
http://msdn.microsoft.com/en-us/library/6sh2ey19(VS.80).aspx
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trenstarCommented:
Hi Tekati68

I am interested in how you read RFID tags?
Are you able to lock the tags in order to stop other readers / users from reading your tags and modifying the data on the tag?

Currently using Sirit reader with the GEN 2 tags, but when I lock the fields on the tags (kill, access, tid, tag_id, user_data), I am still able to read the tag without the new access password.
All this in C# and using the RAPID sdk.

Hop you can help!

Thanks
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