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Posted by:
Deepak L M
Article
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527 times |
Namespaces in .NET
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Namespaces in .NET
A Namespace is a group of related classes. It is a good practice to
group related classes into a namespace when you create a class library.
The main advantage of using namespaces is, to avoid conflicts when you
have multiple classes with the same name. For example, .NET comes with
a class called Form . Suppose you also write another class called
Form in your application and if you refer to the class Form , how
does the compiler know which Form you are refering to ?
Here is the importance of namespace . You can refer to the .NET Form
using the fully qualified name, including the namespace like this :
System.Windows.Forms.Form
And you can refer to your own Form like this :
MyApplication.Form, where MyApplication is your namespace.
So, namespaces allow you to avoid name conflicts!
All classes in .NET class library are grouped into namespaces. You can
use all the classes using the fully qualified name, including the
namespace also along with the class name.
• System.Windows.Forms.Form
• System.String
• System.Double
If you want to declare a Button object, you must do the following :
System.Windows.Forms.Button myButton;
It is not mandatory to use the namespace also along with the name. You
may use the using directive on top of the class and safely avoid the
need to write the fully qualified name everytime when you refer to a
class.
using System.Windows.Forms.Button;
If you have the above line of code on top of the class file, you don t
need to type the namespace name System.Windows.Forms with all the
classes in this namespace. You can simply use class name directly as
shown below:
Button myButton;
.NET Namespaces
Here is a list of some of the namespaces in .NET class library.
• System
• System.Xml
• System.Data
• System.Data.OleDb
• System.Data.SqlClient
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