What is override in c#?

Override is basically used when you need to provide your own definition for existing method.

Hi Joe,

Override is explained by below example.

Taking an example of simple requirement , suppose we need to calculate area of different shapes which has different formula for calculating area.

public abstract class shapes
    {
        // Abstract Method
        public abstract void calculateArea();
    }

here i have made calculate area is abstract method because derived shape class will implement it different way.

here is first shape Square.

public class sqaure : shapes
    {
      public  float Area;
       public float length;

        public override void calculateArea()
        {
            // provide implementation

            Area = (length * length);

            Console.WriteLine("Sqaure Area : " + Area);
        }

    }


our 2nd example shape is circle which has Area is being calculated by formula Pi*R*R
where r is radius of circle.

public class Circle : shapes
    {
        public double Area;
        public float radius;
        public const double Pi = 3.14;

        public override void calculateArea()
        {
            // provide implementation

            Area = (Pi* radius * radius);

            Console.WriteLine("Circle Area : " + Area);
        }

    }
    class Program
    {
        static void Main(string[] args)
        {
            sqaure sq = new sqaure();
            sq.length=10;

            sq.calculateArea();

            Circle c = new Circle();
            c.radius = 10;

            c.calculateArea();

            Console.ReadLine();

        }
    }

so basically Square and circle has override the abstract calculateArea method and implemented the formula to calculate the area of that particular shape.

Hope this make senses.

hello!

have a look at these links
http://www.dotnet-tricks.com/Tutorial/csharp/U33Y020413-Understanding-virtual,-override-and-new-keyword-in-C
http://www.c-sharpcorner.com/UploadFile/2072a9/method-overriding-in-C-Sharp/

:)

Thank you for your answer.

Thank you for This answer.
by the way, could you please give me a few examples?

Hi There Joe,

override is modifier which will be used when ever we want to change the method implementation in derived class for abstract or virtual methods from base class.

In Above example tostring is the method which is used to convert object into string.

By overriding the functionality here we are trying to format string by extending the tostring() method.

Hope this will help.

Abhishek

you can also check below link

http://msdn.microsoft.com/en-us/library/ebca9ah3.aspx