Learning inheritance, rewriting, virtual methods

It's so tiring for me! Pressure is great, so far I have only a little knowledge of inheritance, and the virtual method and rewrite is more dizzy, and sometimes dizzy head hurts Oh! Hey, hey, hey.

As I write some now, are not too understand:

EG:

Using System;

Using System.Collections.Generic;

Using System.Linq; Using System.Text;

Using System.Threading.Tasks;

Namespace P_20150423_2 {

Class Internowork {//Network department//name public string name {get; set;}

Base salaries

Public decimal Basesalary {get; set;}

Project Commission

Public decimal Percentage {get; set;}

Wait a minute

Total Wages

Public decimal Zonggozi {get; set;}

Virtual creates a virtual method that can be modified by the quilt class

Public virtual decimal finalsalary ()

{Decimal a = basesalary + Percentage;         return A; }

Public virtual String str () {return null; }     } }

Learning inheritance, rewriting, virtual methods