What is Namespaces In C#?

A namespace is a method of organizing a group of assemblies, classes, or types. A namespace acts as a container—like a disk folder—for classes organized into groups usually based on functionality.

Namespaces are heavily used in C# programming in two ways. First, the .NET Framework uses namespaces to organize its many classes, as follows:

System.Console.WriteLine("Hello World!");

System is a namespace and Console is a class in that namespace. The using keyword can be used so that the complete name is not required, as in the following example:

using System;

Console.WriteLine("Hello");

Console.WriteLine("World!");

Second, declaring your own namespaces can help you control the scope of class and method names in larger programming projects. Use the namespace keyword to declare a namespace, as in the following example:

namespace SampleNamespace

{

    class SampleClass

    {

        public void SampleMethod()

        {

            System.Console.WriteLine(

              "SampleMethod inside SampleNamespace");

        }

    }

}

Namespaces have the following properties:

·         They organize large code projects.

·         They are delimited by using the . Operator.

·         The using directive obviates the requirement to specify the name of the namespace for every class.

·         The global namespace is the "root" namespace: global::System will always refer to the .NET Framework namespace System.

The following is list of some important and frequently used .NET namespaces:

·         System.Collections

·         System.Data

·         System.Diagnostics

·         System.Drawing

·         System.IO

·         System.Net

·         System.Reflection

·         System.Runtime

·         System.Security

·         System.Threading

·         System.Web

·         System.Windows.Forms

·         System.Xml

A C# namespace is the equivalent of a Java language package.