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What is class library in .NET

Posted By :Sajid P K     Posted Date :October 15, 2010    Points :10   Category :.NET Framework 
class library is a collection of prewritten, ready-made software routines that act as templates for programmers to use in writing object-oriented application programs


For More Reference:


http://msdn.microsoft.com/en-us/library/ms229335(VS.80).aspx


You can also find related Interview Question to What is class library in .NET  below: 

If any .NET language has access to everything in the Base Class Library, why is there so much talk about C#?

  
Although in theory all .NET languages have equal access to the BCL, in reality it was left up to the language teams to determine what level of support they wanted to offer, at least beyond the minimums needed for basic compliance. In our opinion, C#, because it was developed as a new language specifically for the .NET platform, has the best support for .NET applications. (More...)

How will you maintain a Session values in Class Library?

  
Using HttpContext class

HttpContext.Current.Session["Value"] (More...)

what is mean by .NET Framework Class Library?

  
contains thousands of classes organized logically through a namespaces. You can add these classes in your web or Windows application where needed to reduce developing time (More...)

Which of the following statements are correct about the Collection Classes available in Framework Class Library?

  
A.Elements of a collection cannot be transmitted over a network.
B.Elements stored in a collection can be retrieved but cannot be modified.
C.It is not easy to adopt the existing Collection classes for newtype of objects.
D.Elements stored in a collection can be modified only if allelements are of similar types.
E.They use efficient algorithms to manage the collection, thereby improving the performance of the program.

Answer: Option E (More...)

What is the difference between a Struct and a Class?

  
The struct type is suitable for representing lightweight objects such as Point, Rectangle, and Color. Although it is possible to represent a point as a class, a struct is more efficient in some scenarios. For example, if you declare an array of 1000 Point objects, you will allocate additional memory for referencing each object. In this case, the struct is less expensive.

When you create a struct object using the new operator, it gets created and the appropriate constructor is called. Unlike classes, structs can be instantiated without using the new operator. If you do not use new, the fields will remain unassigned and the object cannot be used until all of the fields are initialized.

It is an error to declare a default (parameterless) constructor for a struct. A default constructor is always provided to initialize the struct members to their default values.

It is an error to initialize an instance field in a struct.

There is no inheritance for structs as there is for classes. A struct cannot inherit from another struct or class, and it cannot be the base of a class. Structs, however, inherit from the base class Object. A struct can implement interfaces, and it does that exactly as classes do.

A struct is a value type, while a class is a reference type. (More...)

Can we call a base class method without creating instance?

  
Its possible If its a static method.

Its possible by inheriting from that class also.

Its possible from derived classes using base keyword. (More...)

What is Private Constructor? and it's use? Can you create instance of a class which has Private Constructor?

  
When a class declares only private instance constructors, it is not possible for classes outside the program to derive from the class or to directly create instances of it. (Except Nested classes)
Make a constructor private if:

1) You want it to be available only to the class itself. For example, you might have a special constructor used only in the implementation of your class' Clone method.

2) You do not want instances of your component to be created. For example, you may have a class containing nothing but Shared utility functions, and no instance data. Creating instances of the class would waste memory. (More...)

What is the difference between interface and abstract class ?

  
a class may inherit several interfaces, a class may inherit only one abstract class (More...)

Differentiate between a template class and class template.

  
Template class:
A generic definition or a parameterized class not instantiated until the client provides the needed information. It's jargon for plain templates.

Class template:
A class template specifies how individual classes can be constructed much like the way a class specifies how individual objects can be constructed. It's jargon for plain classes. (More...)

What is an adaptor class or Wrapper class?

  
A class that has no functionality of its own. Its member functions hide the use of a third party software component or an object with the non-compatible interface or a non- object- oriented implementation. (More...)

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