INTERVIEW QUESTIONS MICROSOFT ASP.NET 2.0 DETAILS

Question: Can you explain what inheritance is and an example of when you might use it?

Answer: Inheritance helps in the reusability of the code. The class from which another class is derived is called base class. Those methods of the base class can be overridden. The deried class can also implement the methids of the base class. C#.net does not allow multiple inheritance. But multi level inheritance is possible. For eg. Class B derives from Class A, and class C can derive from Class B and so on...

One example in layman terms will be the example of a car. We can define the general features os a car like four tyres, engine poweretc in the base class. The derived class can use this as a base and extend its functionalities like sports car(eg. four wheel drive).

Inheritance helps in the reusability of the code. The class from which another class is derived is called base class. Those methods of the base class can be overridden. The deried class can also implement the methids of the base class. C#.net does not allow multiple inheritance. But multi level inheritance is possible. For eg. Class B derives from Class A, and class C can derive from Class B and so on...

One example in layman terms will be the example of a car. We can define the general features os a car like four tyres, engine poweretc in the base class. The derived class can use this as a base and extend its functionalities like sports car(eg. four wheel drive).
Source: CoolInterview.com

Base Class is derived by Sub Class. Bass class type definition and methods are used in sub class object.
public Class Carseeting
Dim seat as int
public function sitting(Byval totalseat as int)as int
seat=totalseat
end function
end class
public class Assemplecar
inherit Carseeting
dim total as int
public function sittingcovercharge(Byval totalseat as int)as int
total+=totalseat*1500
end function
end class
class honda
public sub main()
dim ob as new Assemplecar
c.w.l(ob.sittingcovercharge(ob.sitting(6)))
end sub
end class Source: CoolInterview.com

Inheritence is a process of creating a type such as a class or interface from an existing type such as class or interface.

EX:

class Book
{
public void A1();
{
console.writeline("A1");
}
}
class Author : Book
{
public void A2();
{
console.writeline("A2");
}
} Source: CoolInterview.com

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