C# Namespaces and Comments

Namespaces are the way to segregates the C# classes into reasonable groupings.

Let us consider C# statement,

    System.Console.WriteLine("testing");

here System is the namespace in which Console class is located. class in the namespace can be accessed using dot (.) operator.

Using directive can be used to import the namespace System in the program. Once a namespace is imported, we can use the elements of that namespace without using the namespace as prefix.

C# Program which Using namespaces

This C# program using System namespace and not using System prefix for using methods of Console class.

using System;
public class FirstApp
{
    public static void Main()
    {
        Console.WriteLine("Welcome to codingpointer.com to learn C#.");
        Console.ReadKey();
    }
}

Output:

C:> csc FirstApp.cs
C:> FirstApp
Welcome to codingpointer.com to learn C#.

C# Comments

Comments play a very important role in the maintainance of any program.

Two types of comments in C#,

• Single line cimments - need to use //<comments>
• Multiline comments - need to use /* <comments> */

/*
 This C# program Using System namespace 
 Also added single and multiline comments.
 */
using System; // System is a namespace
public class FirstApp
{
    // Main method which starts the program execution.
    public static void Main()
    {
        // Prints welcome text
        Console.WriteLine("Welcome to codingpointer.com to learn C#.");
        // Waits till any key press
        Console.ReadKey();
    }
}

Output:

C:> csc FirstApp.cs
C:> FirstApp
Welcome to codingpointer.com to learn C#.

Creating Class using namespace

namespace keyword is used to add class inside the namespace, here FirstApp class is added inside Test namespace.

    /*
 This C# program Using System namespace 
 Also added single and multiline comments.
 */
using System; // System is a namespace

namespace Test
{
    public class FirstApp
    {
        // Main method which starts the program execution.
        public static void Main()
        {
            // Prints welcome text
            Console.WriteLine("Welcome to codingpointer.com to learn C#.");
            // Waits till any key press
            Console.ReadKey();
        }
    }
}