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C# Namespaces

C# Namespaces

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.

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

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!");  
        }  
    }  
}  

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();    
    }  
}

Output:

Hello First Namespace
Hello Second Namespace

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();  
    }  
}  

Output:

Hello Namespace
Welcome Namespace

 

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