oops concept c#

Question

create an outer class containing mehod then inner class containing method now in main method access both outer and inner class method?how can we access plzz provide solution

Harshad Pansuriya · Answer

Hi Ashutosh Please Refer This Link You have idea given Here : OOps Concept in c#

Afzaal Ahmad Zeeshan · Answer

First of all here is a tip the concept is not OOPS it is OOP; Object-oriented programming . OOPS does not exist. :-) Secondly the inheritance that you are talking about (as you are talking) is not able to be implemented. Why? Because a parent cannot call the functions of a child object. A child has ability to call the function of a parent class. That is the basic fundamental concept of inheritance. Let us see how class Father { public void SayHello() { Console.WriteLine(Hello); } } class Son : Father { // SayHello exists public void SayBye() { Console.WriteLine(Catch you later!); } } Now in the above inheritance you see that Son has the SayHello function but it does also hold a definition for SayBye function. Why? Because of inheritance a derived class can for sure inherit the functions of base class but at the same time it can create more distinct functions in it also; for example SayBye. new Father().SayBye(); // Doesn't work new Son().SayHello(); // Works; inheritance new Son().SayBye(); // Works If you try to call it on Father that won't work because Father doesn't contain a definition for SayBye inheritance works from Top-bottom (Father-to-Son) not the other way around. So that is the problem. However if you cast the Father to Son it would be able to call the function again as if it were defined as a Son object. :-) (new Father() as Son).SayBye(); // Works; But the sad side is that it will cause a NullReferenceException because Son is not yet instantiated.