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ASP.Net: Session Object: Item has already been added. Key in dictionary: 'MyKey' Key being added: 'MyKey'

Posted on 2009-04-08
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Last Modified: 2012-06-27
This is bizarre.

I've been doing ASP for over 10 years and I've never seen this before.   The below line of code is failing.  Why?  I've re-assigned values to collection keys dozens of times.  Why would this start complaining now?

The error message:

 Item has already been added. Key in dictionary: 'MyKey' Key being added: 'MyKey'
Session["MyKey"] = "some string"

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Question by:ZuZuPetals
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by:sunithnair
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I'm not using Server.Transfer, so the expert's comment doesn't really apply.

No satisfactory answers.
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