One of the most likely .NET interview questions asked in the interview, so you should include the following points in your answers.

Similarities between classes and structures: -

• Both can have constructors, methods, properties, fields, constants, enumerations, events, and event handlers.
• Structures and classes can implement interface.
• Both of them can have constructors with and without parameter.

Both can have delegates and events.

Key differences are: -

• Structures are value types and classes are reference types. So structures use stack and classes use heap.
• Structures members cannot be declared as protected, but class members can be. You cannot do inheritance in structures.
• Structures do not require constructors while classes require.
• Objects created from classes are terminated using Garbage collector. Structures are not destroyed using GC.

Following you can see video on regular expressions with some practical demonstrations: -

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