Abstract vs Virtual

Abstract - no implementation (no body) ,

                 MUST overridden,

                 Child cannot call base.method(), because Abstract Method no body,

                 only for Abstract Class.

                 semicolon at end.

Virtual- MAY implementation,

              Can overridden, if you like to use child method , u can write it ,else it will use base method.

              Virtual Method Can call base.method(), straight call base class method

abstract class A

{

public virtual int testVrtual()

    {

       return 0;

    }

    

    public abstract int test();

}