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C# Namespaces

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What is the use of namespace in C# ?

  • Namespaces in C# are used to organize too many classes so that it can be easy to handle the application.
  • In a simple C# program, we use System.Console where System is the namespace and Console is the class.
  • To access the class of a namespace, we need to use namespacename.classname. We can use using keyword so that we don't have to use complete name all the time.
  • learn c# tutorials - class-object-contructor-member-function-in-csharp in c#

    learn c# tutorial - class-object-contructor-member-function-in-csharp in c# Example

  • In C#, global namespace is the root namespace.
  • The global::System will always refer to the namespace "System" of .Net Framework.
Namespace

Namespace

C# namespace example

  • Let's see a simple example of namespace which contains one class "Program".
using System;  
namespace ConsoleApplication1  
{  
class Program  
{  
static void Main(string[] args)  
{  
Console.WriteLine("Hello Namespace!");  
}  
}  
}  
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C# examples - Output :

Hello Namespace!

C# namespace example: by fully qualified name

  • Let's see another example of namespace in C# where one namespace program accesses another namespace program.
using System;  
namespace First {  
public class Hello  
{  
public void sayHello() { Console.WriteLine("Hello First Namespace"); }  
}  
}  
namespace Second  
{  
public class Hello  
{  
public void sayHello() { Console.WriteLine("Hello Second Namespace"); }  
}  
}  
public class TestNamespace  
{  
public static void Main()  
{  
First.Hello h1 = new First.Hello();  
Second.Hello h2 = new Second.Hello();  
h1.sayHello();  
h2.sayHello();  

}  
}  
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C# examples - Output :

Hello First Namespace
Hello Second Namespace
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C# namespace example: by using keyword

  • Let's see another example of namespace where we are using "using" keyword so that we don't have to use complete name for accessing a namespace program.
using System;  
using First;  
using Second;  
namespace First {  
public class Hello  
{  
public void sayHello() { Console.WriteLine("Hello Namespace"); }  
}  
}  
namespace Second  
{  
public class Welcome  
{  
public void sayWelcome() { Console.WriteLine("Welcome Namespace"); }  
}  
}  
public class TestNamespace  
{  
public static void Main()  
{  
Hello h1 = new Hello();  
Welcome w1 = new Welcome();  
h1.sayHello();  
w1.sayWelcome();  
}  
}  
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C# examples - Output :

Hello Namespace
Welcome Namespace


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