Constructors in C#

The call to the constructors is completely governed by the rules of the overloading here.
Calling Constructor from another Constructor:
You can always make the call to one constructor from within the other. Say for example :

public class mySampleClass
{
public mySampleClass(): this(10)
{// This is the no parameter constructor method.// First Constructor}
public mySampleClass(int Age)
{// This is the constructor with one parameter.// Second Constructor}}
Very first of all let us see what is this syntax :
public mySampleClass(): this(10)

Static Constroctor:
This is a new concept introduced in C#. By new here I mean that it was not available for the C++ developers. This is a special constructor and gets called before the first object is created of the class. The time of execution cannot be determined, but it is definitely before the first object creation - could be at the time of loading the assembly.Static Constructors :


public class myClass
{
static myClass()
{// Initialization code goes here.// Can only access static members here.}// Other class methods goes here}

Notes for Static Constructors :
1. There can be only one static constructor in the class.
2. The static constructor should be without parameters.
3. It can only access the static members of the class.
4. There should be no access modifier in static constructor definition

Firstly, the call to the static method is made by the CLR and not by the object, so we do not need to have the access modifier to it.

Secondly, it is going to be called by CLR, who can pass the parameters to it, if required, No one, so we cannot have parameterized static constructor.

Thirdly, Non-static members in the class are specific to the object instance so static constructor, if allowed to work on non-static members, will reflect the changes in all the object instances, which is impractical. So static constructor can access only static members of the class.

Fourthly, Overloading needs the two methods to be different in terms to methods definition, which you cannot do with Static Constructors, so you can have at the most one static constructor in the class.

4. Can we access static members from the non-static ( normal ) constructors ?
Yes, We can. There is no such restriction on non-static constructors. But there is one on static constructors that it can access only static members.

3. What if I have the constructor public myDerivedClass() but not the public myBaseClass() ?
It will raise an error. If either the no parameter constructor is absent or it is in-accessible ( say it is private ), it will raise an error. You will have to take the precaution here.

Windows Process has been Shut down..(Blue screen error)

Hello,
My System has not shutting down. when ever i try ... it s showing Windows process has been shut down with blue screen..I think winlogon file has corrupted in registry.
I don t know the solution for this...

Difference between Webservice ,Remoting , WCF.Net 3.5

Web Services..
1.It Can be accessed only over HTTP
2.It works in stateless environment
3.It support only the datatypes defined in the XSD type system, limiting the number of objects that can be serialized.
4.It support interoperability across platforms, and are ideal for heterogeneous environments.

.Net Remoting..
1.It Can be accessed over any protocol
2.Provide support for both stateful and stateless environments through Singleton and SingleCall objects
3.Using binary communication, .NET Remoting can provide support for rich type system
4.It requires the client be built using .NET, enforcing homogenous environment.

WCF is the Windows Communication Foundation which is shipped along with Dot Net 3.0/3.5. User's having 2.0 framework can make use of WCF by installing the MS add-in component for WCF. WCF comes up as a replacement for Remoting and Web service in dotnet.
The main feature of WCF is it's security. It can use the protocols like basice,wsHttp,tcp...wsHttp comes with default windows based security feature. WRT web services WCF works with the industry standard Contract based protocols.
The componets WCF are data contract, Service Contract and the Service programme. WCF also supports many of the advanced WS-* Web service standards, which can provide rich Web service communication across platforms. WCF can be extended to use protocols other than SOAP to communicate with Web services, for example, Rich Site Summary (RSS). It is interoperable with WSE 3.0, System.Messaging, .NET Enterprise Services, and ASMX Web services.This means that, with little or no change to code, existing applications that are built with these technologies can interoperate with WCF services. WCF contracts define the behavior of WCF services. They are created in code by service developers, and are exposed to clients in the service metadata.

The five types of contracts:
Service Contracts
Operation Contracts
Data Contracts
Message Contracts
Fault Contracts

WCF is flexible because its services can be hosted in different types of applications. The following lists several common scenarios for hosting WCF services:IISWASSelf-hostingManaged Windows Service