Covariance and Contravariance supported for generic type

Apart from convariance and contravariance available in assignments, parameter types and return types, it is available for genericand delegate types also from C# 4.0 onwards. Covariant types convert from a wider type to narrower type. (e.g., int  to short.).Contravariant types convert from a narrower type to a wider type(For example, from string to object.).

Example:

 Output: Contravariant

 Output: Covariant