static void Main(string[] args)
{
//Abstraction
//Only DoIt is visible to me
Abstraction abs = new Abstraction();
abs.DoIt();
//Inheritance
Parent p = new Parent();
p.ParentMethod_1();
Child1 ch1 = new Child1();
ch1.ParentMethod_1(); //using over-ride //Child1 o/p
// Child1 ch1_1 = new Parent();
// ch1_1.ParentMethod_1(); - Error
Parent ch1_2 = new Child1();
ch1_2.ParentMethod_1(); //using over-ride
Child2 ch2 = new Child2();
ch2.ParentMethod_1(); //using New //Parent o/p
//important!!
Parent ch2_1 = new Child2();
ch2_1.ParentMethod_1();
//Output
// ParentMethod
// ParentMethod_1 in child1
// ParentMethod_1 in child1
// ParentMethod_1 in Child2 as new
// ParentMethod
}