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What are class access modifiers ?

Posted By :Muthu     Posted Date :November 02, 2010    Points :10   Category :C# 
Access modifiers are keywords used to specify the declared accessibility of a member or a type. This section introduces the four access modifiers:
. Public - Access is not restricted.
. Protected - Access is limited to the containing class or types derived from the containing class.
. Internal - Access is limited to the current assembly.
. Protected inertnal - Access is limited to the current assembly or types derived . from the containing class.
. Private - Access is limited to the containing type.


You can also find related Interview Question to What are class access modifiers ?  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...)

Explain about public and protected Access Modifiers?

  
Public:

public is an access modifier for types and type members. This is the most permissive access level as there are no restrictions on accessing a public type or type member.

protected:

protected is an access modifier for type members only. A protected member is only accessible within the body of the containing type and from within any classes derived from the containing type (More...)

Explain about private and internal Access Modifiers?

  
Private:
========
private is an access modifier for type members only. private access is the least accessible and such members are only accessible within the body of the containing type.
Note that nested types within the same containing body can also access those private members.

Internal:
--------
internal is an access modifier for types and type members. internal members are accessible only within file of the same assembly. It is an error to reference an internal type or internal type member outside the assembly within which it was declared.

A common use of internal access is in component-based development because it enables a group of components to interact in a private matter without being exposed to the outer world. For example, a Data Access Layer could have several classes with internal members that are only used by the DAL.
(More...)

How can you access a private method of a class?

  
Use .Net Reflection. Using reflection we can invoke private methods too.

Example:

Car car = new Car();
Type type = car.GetType();
MethodInfo methodInfo = type.GetMethod("ShiftGearUp", BindingFlags.NonPublic | BindingFlags.Instance);
methodInfo.Invoke(car, null);

Pre: Create a class Car with private method "ShiftGearUp" (More...)

What is the Difference between Internal and Protected Internal Access Modifiers?

  
Internal :

It can be accessed by any code in the same assembly but cannot be accessable in another assembly

Protected Internal :

It can be accessed by any code in the same assembly, or by any derived class in another assembly. For a particular project. (More...)

What are Access Modifiers

  
Public - Access to same assembly or another assembly that references it.

Private - Access to same class or struct.

Protected - Access to same class or struct, or in a class that is derived.

Internal - Access to any code in the same assembly, but not from another assembly.

Protected Internal - Access to any code in the assembly in which it is declared, or from within a derived class in another assembly.
(More...)

What are the event's access modifiers ?

  
Event's are always public can be used where ever registered. But we can have access modifiers in events.Wecan have events with protected keyword which will be accessible only to inherited classes.We can have private events only for that class. (More...)

How many Access Modifiers in JAVA?

  
It's having Three Access Modifiers.
1.Private
2.Public
3.Protected
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How many Access Modifiers in C# or ASP.Net?

  
It's having Four Access Modifiers.
1.Private
2.Public
3.Protected
4.Internal
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What is Active Directory? What is the namespace used to access the Microsoft Active Directories? What are ADSI Directories?

  
Active Directory Service Interfaces (ADSI) is a programmatic interface for Microsoft Windows Active Directory. It enables your applications to interact with diverse directories on a network, using a single interface. Visual Studio .NET and the .NET Framework make it easy to add ADSI functionality with the DirectoryEntry and DirectorySearcher components.

Using ADSI, you can create applications that perform common administrative tasks, such as backing up databases, accessing printers, and administering user accounts. (More...)

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