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C# NamespacesNamespaces 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 exampleLet'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 nameLet'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 keywordLet'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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