There are two kinds of inheritance
1. Implementation inheritance
2.Interface inheritance
Structs can not be derived from classes, they are always derived from System.ValueType.
A class cannot inheritate from multiple classes but can inherit from a class and multiple interfaces, c# is known as single inheritance programming language
When a derived class inherits from a base class, it gains all the methods, fields, properties and events of the base class. To change the data and behavior of a base class, you have two choices: you can replace the base member with a new derived member, or you can override a virtual base member.
If the method in the derived class is not preceded by new or override keywords, the compiler will issue a warning and the method will behave as if the new keyword were present
The base class method can be called from within the derived class using the base keyword.
1: public class BaseClass
2: {
3: public virtual void Test()
4: {
5: Console.WriteLine("Base");
6: }
7:
8: }
9: public class AClass : BaseClass
10: {
11: public new void Test()
12: {
13: Console.WriteLine("AClass");
14: }
15: }
16: public class BClass : BaseClass
17: {
18: public override void Test()
19: {
20: Console.WriteLine("BClass");
21: }
22: }
23: class Program
24: {
25:
26: static void Main(string[] args)
27: {
28:
29: BaseClass basev = new BaseClass();
30: basev.Test();
31: BaseClass aclass = new AClass();
32: aclass.Test();
33: BaseClass bClass = new BClass();
34: bClass.Test();
35: Console.Read();
36:
37: }
38: }
