Constructor and Destructor in .NET

What is a Constructor? 


It is the first method that are called on instantiation of a type. It provides way to set default values for data before the object is available for use. Performs other necessary functions before the object is available for use.


What is a Destructor?


It is called just before an object is destroyed. It can be used to run clean-up code. You can't control when a destructor is called since object clean up by common language runtime.

Implement a Web Service in .NET

Explain with code sample how to Implement a Web Service in .NET?

Following is code in VBScript and C# both respectively.

In VBScript :

<%@ WebService Language="VBScript" Class="KmToMConvert" %>

Imports System

Imports System.Web.Services

Public Class KmToMConvert :Inherits WebService

   <WebMethod()> Public Function KilometerToMeter(ByVal Kilometer As String) As String 

         return (Kilometer * 1000)

         end function

end class

In C# :

[WebService(Namespace = http://tempuri.org/)]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

[System.ComponentModel.ToolboxItem(false)]

// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 

// [System.Web.Script.Services.ScriptService]

public class Service1 : System.Web.Services.WebService

{

     [WebMethod]

     public string HelloWorld()

     {

            return "Hello World";

     }

}

Private virtual methods in C#.NET

Can private virtual methods be overridden in C#.NET? 


No, moreover, you cannot access private methods in inherited classes, They have to be protected in the base class to allow any sort of access. 

Multiple inheritance in C#.Net

Does C#.Net support multiple inheritance?


No, C#.Net does not support multiple inheritance,  but we can use interfaces to achieve functionality of multiple inheritance.

What is serialization

Explain serialization ?


Serialization is a process of converting an object into a stream of bytes. .Net has 2 serializers namely XMLSerializer and SOAP/BINARY Serializer. Serialization is maily used in the concept of .Net Remoting.