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What is an object?

An object is an instance of a class using which we can access the properties, methods of that class. An object is created using "New" keyword. An object in memory contain the information about the methods, properties and behavior of that class.

What is Constructors?

Constructor is special method of the class which comes with same name as class.Constructor will be automatically invoked when an instance of the class is created. Constructors are mainly used to initialize private fields of the class while creating an instance for the class.

What is the difference between ref & out parameters?

An argument passed as ref must be initialized before passing to the method whereas out parameter needs not to be initialized before passing to a method.

What is difference between constants and read-only?

The "readonly" keyword is different than that of const keyword. A const field can only be initialized at the declaration of the field. A "Const" field is a compile-time constant. A readonly field can be initialized either at the declaration or in a constructor. Therefore, readonly fields can have different values depending on the constructor used. The readonly field can be used for runtime constants.

What are value types and reference types?

Variables those holds actual data and stored on stack are "Value" types. Ex. int, enum , byte, decimal, double, float, long Variables those holds reference to the actual data are of "Reference" types. Ex. string , class, interface, object