C# namespace | nested namespace in c# | C# - Namespaces

C# namespace|nested namespace in c#

C# namespace

It is a logical collection of classes, methods,variables,events,properties etc.

so we can say that namespace in c# (C Sharp) is Logical unit of Classes,methods or function and properties.

You know, namespace is just like of someone address let ramu is from India, ok so here we know that ramu belongs from india and india having 

multiple state,multiple city,multiple District,multiple taluka or multiple village.

similary when we are talkig about namespace in c# so first of all something are predefined by Microsoft which is logical bind in single unit called namespace.

In C# thire are multiple namespace in dotnet 2.0 version having 26 namespace and in these namespace thousands of classes are available.

let see:

System -- it is also namespace in c# and in this namespace having multiple classes, like Console class,AppContext class,AppDomain Class,

Activator class,Arry class,Attribute class,ConsoleCancelEventArg Class etc.. 

Namespace having also exist namespace called sub namespace. if we are taking about sub namespace of System so system namespace having multiple 

sub namespace like Collection namespace,Text namespace ,Linq namespace,Threading namespace,CodeDom Namespace,Configuration namespace,ComponentModel

namespace,Data,Dynamic,IO,Media,Net etc..

Namespace having also consist event(it is also called delegate. about delegate I discuss in latter article.). So in namespace having events are

Action,AppDomainInitializer,AssemblyLoadEventHandler.

C# namespace | nested namespace in c# | C# - Namespaces 

For Interview:

Namespace is Logical collection of namespace,classes,Events, Methods,Struct,Enum etc.

By the 'using' keyword we are going to add or use namespace so that we are able to access all the classes and methods,properties,events in our 

applications.

As per above discussion all namespace are predefine by the microsoft, but we are also create custome namespace suppose we have develope One Library also called dll

so first of all see herichery

                        Namespcae

                            |

                          Class/Struct/Enum/Event

                             |

                           Methods/Function/Variables

how to use namespace in C#

By the 'Using' keyword like

using System;

I hope Namspace topic, it is clear all of you:

#region By:Dheeraj Kumar Jha (dotnetshala)

class ClsEmployee

{

    public static void Main()

    {

        Console.WriteLine("Welcome to dotnerShala");  // here we have got error in console because address of console is not exist.

        // that's why we have to need use namespace called system beacuse console class belong from System namespace.

    }

}

#endregion

#region By:Dheeraj Kumar Jha (dotnetshala)

using System;

class ClsEmployee

{

    public static void Main()

    {

        Console.WriteLine("Welcome to dotnerShala");

    }

}

#endregion

C# namespace | nested namespace in c# | C# - Namespaces 

As per above example Colnsole is a Static class which comes under system namespace. Inside the Console class having multiple static methods

like Read(),ReadLine(),Write(),WriteLine(),SetIn(),SetOut()  etc.

by the namespace keyword we are going to create custom namespace.

namespace Demo{

   class ClsEmployee{

}

class ClsHR

{

}

}

In above example demo namespace contain two class so that namespace can contain multiple classes.

I recommended all oops Concept are given below, you are going to learn one by one: 

C# namespace | nested namespace in c# | C# - Namespaces 

1. Class  And Namespace in C#
2. Object
3. Constructor
4. Variables
5. Static Class
6. Static Constructor
7. Static Method
8. Enacpuslation
9. Abstraction
10. Abstact Class
11. Abstract Method
12. Interface
13. Private Constructor
14. Sealed Class
15. Inheritance
16. Polymorphism
17. Method Hiding 
18. Method Overloading
19. Method Overriding 
20. Compile Time Polymorphism
21. Run time Polymorphism
22. Difference between constructor and Static Constructor  

If you have nay query kindly let me know. thanks for the learning have a nice day.