C# Namespaces

by Online Tutorials Library July 14, 2022

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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