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How many in built objects are there in ASP.net?

Posted By :abhay     Posted Date :March 04, 2010    Points :10   Category :ASP.Net 
There are 6 objects.

1. Server
2. Session
3. Application
4. ObjectContext
5. Response
6. Request

You can also find related Interview Question to How many in built objects are there in ASP.net?  below: 

What are major built in Objects in asp.net ?

  
Application

Request

Response

Server

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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...)

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

  
Yes.

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.


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Cache Caching can be used to temporarily store page output or application data either on the client or on the server, which can then be re-used to satisfy subsequent requests and thus avoid the overhead of re-creating the same information.Caching is particularly suitable when you expect to Cache will be applicable to the entire application through out it's life cycle return the same information in the same format for many different requests.

Application Its nothing but similar to Session with a bit difference that is Session objects have scope within a particular session while application objects having scope within entire application. Application are accessible only from code running within the context of the originating application. Other applications running on the system cannot access or modify the values.
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