Briefly highlight the differences between imperative and declarative security as they pertain to code access security.

Briefly highlight the differences between imperative and declarative security as they pertain to code access security.
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Imperative security is implemented by calling methods of Permission objects in code at run time. Declarative security is configured by attaching attributes representing permissions to classes and methods. Imperative security allows a finer control over the point in execution where permissions are demanded, but declarative security is emitted into metadata, and required permissions can be discovered through the classes in the System.Reflection namespace. Additionally, you can request assembly-wide permissions using the Assembly (assembly) directive with declarative security.
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