Difference between structure and class in c?

Answer 1

In C#, a struct is a Value type derived from Object, and provides no inheritance.

A class is also derived from Object but as a Referencetype, also allow subtypes to be drived from a class, unless it is declared as sealed.

That is, a struct like:

public struct A {}

and

a class like:

public sealed class B {}

Are almost the same, except when an instance being passed as an argument to a method, an instance of A is passed by value, while an instance of B is passed by reference (by default).

A class can be declared as abstract, while a struct cannot be one.

class provides a class hierarchy (yes you can build a class tree), while struct is a flat and boring 1-level sealed module unit (but as a value type).