New Delegate Features – Covariance and Contra-variance

With C# programming language 2.0, two very useful features regarding delegates are introduced: covariance and contra-variance. Before we go on to explaining these lets have a bit of review. Suppose we have two classes A and B with A being the parent class of B
    class A
    {
    }
 
    class B : A
    {
    [...]

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