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You have got an application having 10 different modules that requires customers choice on deployment. What should be the architecture preferred in such situation where customers can choose their modules initially and upgrade them if needed?

Posted By :Jean Paul     Posted Date :May 02, 2011    Points :40   Category :.NET Framework 
Plugin Architecture

You can also find related Interview Question to You have got an application having 10 different modules that requires customers choice on deployment. What should be the architecture preferred in such situation where customers can choose their modules initially and upgrade them if needed?  below: 

You have got an application containing 10 modules with each module of 10 MB. But your customer needs only 2 modules at reduced cost. How we should ship the application.

  
We can use plugin architectured application to reduce the shippable size to 20MB with only the 2 modules which customer had chosen.

In this way the cost and size of deployment is reduced + threat of cracking the other modules if shipped together. (More...)

You are designing a single person shooter game application. The player can choose between multiple guns.
1) Pistol with 5 bullets
2) Shotgun with 100 bullets
3) Grenade Launcher with 20 grenades

Each gun will have different sound effects and graphics.

Pressing Ctrl+Space should rotate between guns.
Which design pattern should you employ for this?

  
Use Strategy Pattern.

Explanation: Each gun having different performance and graphics.
So this can be accomodated in the algorithm.

Strategy pattern is best suited for shifting the guns/algorithms

There will be a IGun interface implemented by 3 classes
Pistol : IGun
Shotgun : IGun
GrenadeLauncher : IGun (More...)

What are the namespaces which needed to host a WPF control in Windows form application

  
The following namespaces needs to be referenced :
a)PresentationCore.dll
b)PresentationFramework.dll
c)UIAutomationProvider.dll
d)UIAutomationTypes.dll
e)WindowsBase.dll
(More...)

What namespaces are needed to host a WPF control in Windows form application?

  
The following namespaces needs to be referenced :
a)PresentationCore.dll
b)PresentationFramework.dll
c)UIAutomationProvider.dll
d)UIAutomationTypes.dll
e)WindowsBase.dll

(More...)

What are the HTTP Handlers and HTTP Modules

  
HttpModule and HttpHandler are two components which comes with the HttpPipeLine while moving the request to HttpPipeLine. here HttpModule is used to check the request authentication and then routing so that it should be received by the correct handler(HttpHandler) for the process and then after processing , it validates the request and then route it back to the client. (More...)

What is Application Domain?

  
The primary purpose of the AppDomain is to isolate an application from other applications. Win32 processes provide isolation by having distinct memory address spaces. This is effective, but it is expensive and doesn't scale well. The .NET runtime enforces AppDomain isolation by keeping control over the use of memory - all memory in the AppDomain is managed by the .NET runtime, so the runtime can ensure that AppDomains do not access each other's memory.
Objects in different application domains communicate either by transporting copies of objects across application domain boundaries, or by using a proxy to exchange messages.
MarshalByRefObject is the base class for objects that communicate across application domain boundaries by exchanging messages using a proxy. Objects that do not inherit from MarshalByRefObject are implicitly marshal by value. When a remote application references a marshal by value object, a copy of the object is passed across application domain boundaries. (More...)

I have written an assembly that I want to use in more than one application. Where do I deploy it?

  
Assemblies that are to be used by multiple applications (for example, shared assemblies) are deployed to the global assembly cache. In the prerelease and Beta builds, use the /i option to the Alink SDK tool to install an assembly into the cache:
al /i:myDll.dll
A future version of the Windows Installer will be able to install assemblies into the global assembly cache. (More...)

What is an application domain?

  
An application domain (often AppDomain) is a virtual process that serves to isolate an application. All objects created within the same application scope (in other words, anywhere along the sequence of object activations beginning with the application entry point) are created within the same application domain. Multiple application domains can exist in a single operating system process, making them a lightweight means of application isolation.
An OS process provides isolation by having a distinct memory address space. While this is effective, it is also expensive, and does not scale to the numbers required for large web servers. The Common Language Runtime, on the other hand, enforces application isolation by managing the memory use of code running within the application domain. This ensures that it does not access memory outside the boundaries of the domain. It is important to note that only type-safe code can be managed in this way (the runtime cannot guarantee isolation when unsafe code is loaded in an application domain). (More...)

Minimum number of queues needed to implement the priority queue?

  
Two. One queue is used for actual storing of data and another for storing priorities. (More...)

Describe the techniques for optimising your application?

  
. Avoid round-trips to server. Perform validation on client.
. Save viewstate only when necessary.
. Employ caching.
. Leave buffering on unless there is a dire need to disable it.
. Use connection pooling.
. Use stored procedures instead of in-line SQL or dynamic SQL. (More...)

Differences between application and session.

  
The session object maintains state on a per client basis whereas the application object is on a per application basis and is consistent across all client requests. (More...)

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