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How do we change the configurations of com dcom objects
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Posted Date :
March 15, 2010
Through the tool Dcomcnfg.exe
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How do we change the configurations of com dcom objects
To create a excel file using COM. Whether we need to change any dcom configuration?
Yes we need to give the proper rights to the ASPNET user
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.
What is the relationship between the .NET Framework and DCOM?
DCOM is the COM infrastructure for cross-process communication. The .NET Framework supports a number of pluggable channels and formatters for cross-process communication. When making transitions between managed and unmanaged code, the .NET Framework uses the COM infrastructure, specifically, DCOM. All scenarios using COM+ services use managed-to-unmanaged transitions, and thus use DCOM by default. The .NET Framework also supports SOAP, the Simple Object Access Protocol, for cross-process communication where interoperability is critical.
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.
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.
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.
How can we change priority and what the levels of priority are provided by .NET ?
Thread Priority can be changed by using Threadname.Priority = ThreadPriority.Highest. In the sample provided look out for code where the second thread is ran with a high priority.
Following are different levels of Priority provided by .NET :-
Does SessionID change with every request in the asp.net 2.0 application?
For any web programmer, its obvious to think and believe that SessionId remains same through out the user session and it was right till asp.net1.1. But in asp.net2.0, this behavior has changed. In the asp.net application new sessionid is returned with the response to every request until session objects are not used.
According to MSDN the reason/solution is:
"When using cookie-based session state, ASP.NET does not allocate storage for session data until the Session object is used. As a result, a new session ID is generated for each page request until the session object is accessed. If your application requires a static session ID for the entire session, you can either implement the Session_Start method in the application's Global.asax file and store data in the Session object to fix the session ID, or you can use code in another part of your application to explicitly store data in the Session object."
How can you clean up objects holding resources within your code?
Application, Request, Response, server and session
How many ViewState objects can be created on an aspx page ?
There is no limit. You can have any number of ViewState object on single aspx page. However more Viewstate objects, more slowly it loads.
Can you change the value of a variable while debugging a C# application?
Yes, if you are debugging via Visual Studio.NET, just go to Immediate window.
If all the objects of a class need to be share the same variable, how must you declare that variable ?
shared variables must declared static
How many in built objects are there in ASP.net?
There are 6 objects.
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