Difference between class and structure in csharp?

Answer 1

I'm not sure about csharp, but in OO a class has a state and behaviour whereas structure has only state.

The state of a class is the data members, or attributes of a class. Behaviour of a class is the function members, or the methods of a class. Ie, a class has attributes and functions, but a struct has only attributes.

Historically, classes derived from structures. At one point someone thought of adding behaviour or functionality to structures and the resulting type was called a class.

I'll give you an example.

struct Student {
//state
int YearInCollege;
};

This structure has only data members that can be manipulated in the program. Eg:

Student You;
You.YearInCollege=1; //change state
...
int a=You.YearInCollege; //read state

As you can see, we can read and write the members of a structure as we wish.

Now, let's give the structure a bit of functionality.

class Student {
//behaviour
int WhatsMyYearInCollege(void);
void ChangeMyYearInCollege(int);

//state
int YearInCollege;
};

as you can see, now besides the state we also have functionality to change the state of the class. Now, we'll change the state of the class only through its own member functions, also called mutator functions. Eg:

Student You;

You.ChangeMyYearInCollege(2); //change state through class' own function
...
int a=You.WhatsMyYearInCollege(); //read state through class' own function