What is Abstract Class in C#.Net,How to use Abstract Class in c#.net


•    Abstract class is one type of half define parent class.
•    Its complete implementation is in child class.
•    You cannot create object of abstract class.
•    You can use this abstract class by make its child class and call parent class (Abstract class) method using child class object ass show in Ex.

Example:

namespace CA_AbstactClass
{
    // define abstract class
    abstract class operation
    {
        // define abstract method
        //you can only define but on not implement the method in this class
        public abstract int addition(int n1,int n2);

        // define non abstract method
        public int multiplication(int n1, int n2)
        {
            return n1 * n2;
        }
       
    }
    class Program:operation
    {
        static void Main(string[] args)
        {
            // you can create object of 'Program' class but not 'operation' class
            Program objProgram = new Program();
     int add =objProgram.addition(10,20);
            int mul=objProgram.multiplication(10,20);
            Console.WriteLine("Added : {0}, Multiplied : {1}", add, mul);

        }
       
        // now override the addition method in this class
        // access modifier of abstract method must be same in parent class and child class
        public override int addition(int n1, int n2)
        {
            return n1 + n2;
        }
    }
}

  • If you  have use multiple abstract class they inherit each other than you can implement  abstract method of parent abstract class in child abstract class.
Example:
namespace CA_AbstactClass
{
    // define abstract class
    abstract class operation
    {
        // define abstract method
        //you can only define but on not implement the method in this class
        public abstract int addition(int n1, int n2);

        // define other abstract method
        public abstract int multiplication(int n1, int n2);

    }
   
    abstract class operation1:operation
    {
        // Implementing abstract method
        public override int multiplication(int n1, int n2)
        {
            return n1*n2;
        }
       
    }
    class Program : operation1
    {
        static void Main(string[] args)
        {
            // you can create object of 'Program' class but not 'operation' class
            Program objProgram = new Program();
            int add =objProgram.addition(10,20);
            int mul=objProgram.multiplication(10,20);
            Console.WriteLine("Added : {0}, Multiplied : {1}", add, mul);
        }

        // now override the addition method in this class
        // access modifier of abstract method must be same in parent class and child  class
        public override int addition(int n1, int n2)
        {
            return n1 + n2;
        }
    }
}


    Rules For Abstract class
•    Abstract class can have abstract method or non-abstract method also
•    Abstract method cannot be private.
•    Abstract class cannot be sealed.
•    Abstract method cannot be virtual
•    Abstract member can note be static.
•    Abstract method must be define in only abstract class.


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