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I will briefly discuss the default versions of some of the methods defined in the Object class, and will explain that in many cases, those default versions are meant to be overridden.

References of type Object

The Object type is a completely generic type that can be used to store a reference to any object that can be instantiated in C#.

Methods in the Object class

The Object class defines the following eight methods , which are inherited by every other class:

  • Equals - Overloaded. Determines whether two Object instances are equal.
    • Equals(Object) - Determines whether the specified Object is equal to the current Object .
    • Equals(Object,Object) - Determines whether the specified Object instances are considered equal.
  • Finalize - Allows an Object to attempt to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection.
  • GetHashCode - Serves as a hash function for a particular type.
  • GetType - Gets the Type of the current instance.
  • MemberwiseClone - Creates a shallow copy of the current Object .
  • ReferenceEquals - Determines whether the specified Object instances are the same instance.
  • ToString - Returns a String that represents the current Object .

Because these eight methods are inherited by every other class, they are always available for you to use in your code. (Possibly the most frequently used of these methods is the ToString method.)

Two of the methods in this list are defined in overloaded versions (same name, different formal argument lists) .

The difference between string and String

This author says "string is an alias for System.String. So technically, there is no difference. It's like int vs. System.Int32."

Every class inherits these methods

Because every class is either a direct or indirect subclass of Object , every class in C#, (including new classes that you define) , inherit these methods.

To be overridden...

Some of these methods are intended to be overridden for various purposes. This includes Equals , Finalize , GetHashCode , and ToString , which are all declared virtual .

However, some of them, such as GetType , are not declared virtual and therefore are intended to be used directly without overriding.

Calling methods of the Object class

You can store a reference to any object in a reference variable of type Object .

Because every new class inherits these methods, you can call any of these methods on any reference to any object stored in a reference variable of type Object or in a reference variable of any other type.

And the behavior will be...

If the class from which the object was instantiated inherits or defines an overridden version of one of the methods in the above list, calling that methodon the reference will cause the overridden version to be executed.

Otherwise, calling that method on the reference will cause the default version defined in the Object class to be executed.


The behavior described above is illustrated in the sample program named Polymorph04 , which you can view in its entirety in Listing 7 near the end of this module.

For purposes of illustration, this program deals specifically with the method named ToString from the above list, but could deal with the other virtual methods in the list as well.

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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