What is Covariance and Contravariance

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Published on 2010-03-23T03:59:36Z Indexed on 2010/03/23 4:01 UTC
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Please explain me in simple terms (if possible simple example) the covariance and contravariance in c# .net .

I know many are available(even in stackoverflow) but my problem is in which scenario I should use that is not explained in the articles that I am refering to.

e.g.

Covariance and Contravariance in Delegates (C# Programming Guide)

Thanks

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