VB.NET - Imperative and declarative security

Define imperative and declarative security.

- Security checks can be applied imperatively or declaratively.

- Declarative and imperative are the different syntax schemes used to implement security declarations in .NET Framework.

Imperative security:

- It is implemented by calling methods of 'Permission' objects in code at run time.

- Imperative security is applied by calling the appropriate methods of a 'Permission' object that represents the principal (for role-based security) or system resource (for code access security).

- In imperative implementation, the attribute syntax is not used.

- It is implemented by writing the regular code to provide restrictions.

Declarative security:

- It is configured by attaching attributes representing permissions to classes and methods.

- Additionally, you can request assembly-wide permissions using the assembly directive with declarative security.

- In declarative security, attribute syntax is used.

- The security constraints are stored in the assembly at compile time.

- The disadvantage of declarative security is that there are tools which extract security requirements from the metadata in the assembly.
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