Difference between virtual and abstract methods [duplicate]

Answer 1

Abstract Method:

• If an abstract method is defined in a class, then the class should declare as an abstract class.

• An abstract method should contain only method definition, should not Contain the method body/implementation.

• An abstract method must be over ride in the derived class.

Virtual Method:

• Virtual methods can be over ride in the derived class but not mandatory.
• Virtual methods must have the method body/implementation along with the definition.

Example:

public abstract class baseclass
        {
            public abstract decimal getarea(decimal Radius);

            public virtual decimal interestpermonth(decimal amount)
            {
                return amount*12/100;
            }

            public virtual decimal totalamount(decimal Amount,decimal principleAmount)
            {
                return Amount + principleAmount;
            }
        }

        public class derivedclass:baseclass
        {
            public override decimal getarea(decimal Radius)
            {
                return 2 * (22 / 7) * Radius;
            }

            public override decimal interestpermonth(decimal amount)
            {
                return amount * 14 / 100;
            }
        }