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Why string objects are made immutable?

Posted By :Vinodh     Posted Date :September 19, 2011    Points :40   Category :.NET Framework 
For secutiry and memory efficiency

You can also find related Interview Question to Why string objects are made immutable?  below: 

Why string are called Immutable data Type ?

The memory representation of string is an Array of Characters, So on re-assigning the new array of Char is formed & the start address is changed . Thus keeping the Old string in Memory for Garbage Collector to be disposed. (More...)

Why string are called Immutable data Type ?

The memory representation of string is an Array of Characters, So on re-assigning the new array of Char is formed & the start address is changed . Thus keeping the Old string in Memory for Garbage Collector to be disposed. (More...)

What are immutable objects?

Immutable objects are one whose state cannot be modified after it is created .Example string objects are immutable (More...)

Is it true that COM objects no longer need to be registered on the server?

Yes and No. Legacy COM objects still need to be registered on the server before they can be used. COM developed using the new .NET Framework will not need to be registered. Developers will be able to auto-register these objects just by placing them in the 'bin' folder of the application. (More...)

To create a string literal exclude escape sequence

@string. With adding @ at the beginning you can escape literal (More...)

String is an...........

String is an Object Type. where other data types are reference type in .NET (More...)

Different Types of Remote Objects?

The remoting infrastructure allows you to create two distinct types of remote objects.

1.Client-activated objects - A client-activated object is a server-side object whose creation and destruction is controlled by the client application. An instance of the remote object is created when the client calls the new operator on the server object. This instance lives as long as the client needs it, and lives across one to many method calls. The object will be subject to garbage collection once it''s determined that no other clients need it.

2.Server-activated objects - A server-activated object''s lifetime is managed by the remote server, not the client that instantiates the object. This differs from the client-activated object, where the client governs when the object will be marked for finalization. It is important to understand that the server-activated objects are not created when a client calls New or Activator.GetObject. They are rather created when the client actually invokes a method on the proxy. There are two types of server activated objects. They are:

I. Single call . Single-call objects handle one, and only one, request coming from a client. When the client calls a method on a single call object, the object constructs itself, performs whatever action the method calls for, and the object is then subject to garbage collection. No state is held between calls, and each call (no matter what client it came from) is called on a new object instance.

II.Singleton - The difference in a singleton and single call lies in lifetime management. While single-call objects are stateless in nature, singletons are stateful objects, meaning that they can be used to retain state across multiple method calls. A singleton object instance serves multiple clients, allowing those clients to share data among themselves. (More...)

Describe ways of cleaning up objects.

The run time will maintain a service called as garbage collector.
this service will take care of deallocating memory corresponding to
objects.it works as a thread with least priority.when application
demenads for memory the runtime will take care of setting the high
priority for the garbage collector,so that it will be called for execution
and memory will be released.the programmer can make a call
to garbage colector by using GC class in system name space. (More...)

Where do you store connection string?

Database connection string can be stored in the web config file.
The connection string can be stored in the WEB.Config file under
element. (More...)

What does connection string consist of?

The connection string consists of the following parts:
In general:

Server: Whether local or remote.

Uid: User Id (sa-in sql server)

Password: The required password to be filled-in here

Database: The database name. (More...)

Can I use COM objects from a .NET Framework program?


Any COM component you have deployed today can be used from managed code, and in common cases the adaptation is totally automatic.
Specifically, COM components are accessed from the .NET Framework by use of a runtime callable wrapper (RCW). This wrapper turns the COM interfaces exposed by the COM component into .NET Framework-compatible interfaces. For OLE automation interfaces, the RCW can be generated automatically from a type library. For non-OLE automation interfaces, a developer may write a custom RCW and manually map the types exposed by the COM interface to .NET Framework-compatible types.

Shashi Ray (More...)

Difference between String.Empty and ""

The main difference is lies on memory management.

String.Empty will not create any object of string where as "" (Double Quote or Empty Quote) will create a new object in the memory for the checking the objects. (More...)

How do I convert a numeric type to a string?

Call Sytem.Object.ToString(). For example, if the variable count is an integer, write the following:
string text = count.ToString(); (More...)

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