Interface C#

Interface 

    interface IBankCustomer

    {

        void DepositMoney();

        void WithdrawMoney();

    }

    public class Demo : IBankCustomer

    {

        public void DepositMoney()

        {

            Console.WriteLine("Deposit Money");

        }

        public void WithdrawMoney()

        {

            Console.WriteLine("Withdraw Money");

        }

        public static void Main()

        {

            Demo DemoObject = new Demo();

            DemoObject.DepositMoney();

            DemoObject.WithdrawMoney();

        }

    }

• Interface No need access modifiers, default is public.
• Interface methods only header, no body.
• Interface No Field.
• Interface No Constructor.
• Interface can inherit other interface.
• Child Class must implement all the Interface method.
• Child Class can inherit mutiple Interface.

Different Interface and abstract Class

1.A class cannot inherit more than one class (class DerivedClass : BaseClass1, BaseClass2),

interface can (public class Demo : Interface1, Interface2)

2. Abstract class can have abstract or non abstract method;