ASP.NET INTERVIEW QUESTIONS AND ANSWERS

ASP.NET INTERVIEW QUESTIONS AND ANSWERS 

ASP.NET INTERVIEW QUESTIONS

What is .NET Framework?

.NET Framework is a complete environment that allows developers to develop, run, and deploy the
following applications:
 Console applications
 Windows Forms applications
 Windows Presentation Foundation (WPF) applications
 Web applications (ASP.NET applications)
 Web services
 Windows services
 Service-oriented applications using Windows Communication Foundation (WCF)
 Workflow-enabled applications using Windows Workflow Foundation (WF)
.NET Framework also enables a developer to create sharable components to be used in distributed
computing architecture. NET Framework supports the object-oriented programming model for
multiple languages, such as Visual Basic, Visual C#, and Visual C++. .NET Framework supports
multiple programming languages in a manner that allows language interoperability. This implies
that each language can use the code written in some other language.

                             

What are the main components of .NET Framework?

.NET Framework provides enormous advantages to software developers in comparison to the
advantages provided by other platforms. Microsoft has united various modern as well as existing
technologies of software development in .NET Framework. These technologies are used by
developers to develop highly efficient applications for modern as well as future business needs.
The following are the key components of .NET Framework:
 .NET Framework Class Library
 Common Language Runtime
 Dynamic Language Runtimes (DLR)
 Application Domains
 Runtime Host
 Common Type System
 Metadata and Self-Describing Components
 Cross-Language Interoperability
 .NET Framework Security
 Profiling
 Side-by-Side Execution

 List the new features added in .NET Framework 4.0.

The following are the new features of .NET Framework 4.0:
 Improved Application Compatibility and Deployment Support
 Dynamic Language Runtime
 Managed Extensibility Framework
 Parallel Programming framework

 Improved Security Model

 Networking Improvements

 Improved Core ASP.NET Services

 Improvements in WPF 4

 Improved Entity Framework (EF)

 Integration between WCF and WF

 What is an IL?

Intermediate Language is also known as MSIL (Microsoft Intermediate Language) or CIL (Common

Intermediate Language). All .NET source code is compiled to IL. IL is then converted to machine

code at the point where the software is installed, or at run-time by a Just-In-Time (JIT) compiler.

                                         

 What is Manifest?

Assembly metadata is stored in Manifest. Manifest contains all the metadata needed to do the

following things

 Version of assembly.

 Security identity.

 Scope of the assembly.

 Resolve references to resources and classes.

The assembly manifest can be stored in a PE file either (an .exe or) .dll with Microsoft

intermediate language (MSIL code with Microsoft intermediate language (MSIL) code or in a

stand-alone PE file, that contains only assembly manifest information.

What are code contracts?

Code contracts help you to express the code assumptions and statements stating the behavior of

your code in a language-neutral way. The contracts are included in the form of pre-conditions,

post-conditions and object-invariants. The contracts help you to improve-testing by enabling runtime

checking, static contract verification, and documentation generation.

The System.Diagnostics.Contracts namespace contains static classes that are used to 

express contracts in your code.

Name the classes that are introduced in the System.Numerics namespace.

The following two new classes are introduced in the System.Numerics namespace:

 BigInteger - Refers to a non-primitive integral type, which is used to hold a value of any size. It has no lower and upper

limit, making it possible for you to perform arithmetic calculations with very large numbers, even with the numbers which

cannot hold by double or long.

 Complex - Represents complex numbers and enables different arithmetic operations with complex numbers. A number

represented in the form a + bi, where a is the real part, and b is the imaginary part, is a complex number.

 What is managed extensibility framework?

Managed extensibility framework (MEF) is a new library that is introduced as a part of .NET 4.0 and Silverlight 4. It helps in extending  

your application by providing greater reuse of applications and components. MEF provides a way for host application to consume external

extensions without any configuration requirement.

 Explain memory-mapped files.?

Memory-mapped files (MMFs) allow you map the content of a file to the logical address of an application. These files enable the multiple processes running on the same machine to share data with each Other. The MemoryMappedFile.CreateFromFile() method is used to obtain a MemoryMappedFile object that represents a persisted memory-mapped file from a file on disk.

These files are included in the System.IO.MemoryMappedFiles namespace. This namespace contains four classes and three enumerations to help you access and secure your file mappings.

 What is Common Type System (CTS)?

CTS is the component of CLR through which .NET Framework provides support for multiple languages because it contains a type system that is common across all the languages. Two CTS-compliant languages do not require type conversion when calling the code written in

one language from within the code written in another language. CTS provide a base set of data types for all the languages supported by.NET Framework. This means that the size of integer and long variables is same across all .NET-compliant programming languages. However, each language uses aliases for the base data types provided by CTS. For example, CTS uses the data type system. int32 to represent a 4 byte integer value; however, Visual Basic uses the alias integer for the same; whereas, C# uses the alias int. This is done for the sake of clarity and simplicity.\

ASP.NET INTERVIEW QUESTIONS

ASP.NET INTERVIEW QUESTIONS 

ASP.NET INTERVIEW QUESTIONS -PART -2 

Give a brief introduction on side-by-side execution. Can two applications, one using private assembly and the other using the shared assembly be stated as side-by-side executables?

Side-by-side execution enables you to run multiple versions of an application or component and CLR on the same computer at the same time. As versioning is applicable only to shared assemblies and not to private assemblies, two applications, one using a private assembly and other using a shared assembly, cannot be stated as side-by-side executables.

Which method do you use to enforce garbage collection in .NET?

The System.GC.Collect() method

State the differences between the Dispose() and Finalize().

CLR uses the Dispose and Finalize methods to perform garbage collection of run-time objects of .NET applications.
The Finalize method is called automatically by the runtime. CLR has a garbage collector (GC), which periodically checks for objects in heap that are no longer referenced by any object or program. It calls the Finalize method to free the memory used by such objects. The Dispose method is called by the programmer. Dispose is another method to release the memory used by an object. The Dispose
method needs to be explicitly called in code to dereference an object from the heap. The Dispose method can be invoked only by the  classes that implement the IDisposable interface.

 What is code access security (CAS)?

Code access security (CAS) is part of the .NET security model that prevents unauthorized access of resources and operations, and  restricts the code to perform particular tasks.

 Differentiate between managed and unmanaged code?

Managed code is the code that is executed directly by the CLR instead of the operating system. The code compiler first compiles the managed code to intermediate language (IL) code, also called as MSIL code. This code doesn't depend on machine configurations and can be executed on different machines.
Unmanaged code is the code that is executed directly by the operating system outside the CLR environment. It is directly compiled to  native machine code which depends on the machine configuration.
In the managed code, since the execution of the code is governed by CLR, the runtime provides different services, such as garbage collection, type checking, exception handling, and security support. These services help provide uniformity in platform and languageindependent behavior of managed code applications. In the unmanaged code, the allocation of memory, type safety, and security is required to be taken care of by the developer. If the unmanaged code is not properly handled, it may result in memory leak. Examples of unmanaged code are ActiveX components and Win32 APIs that execute beyond the scope of native CLR.