Namespaces and subnamespaces in C#

Question

begginers question about C#.

In every program I have to include several namespaces, like:

using System;
using System.Collections.Generic;
using Syste         


        

Answer 1

Not all classes in .net is inside one big container.Doing so increases the chance of class name collision and it doesn't look good in the first place.Namespaces are containers that try to keep your library clean and make more sense.Having a FTP class and String class together under one container does not logically make any sense.They do two different things and they should be kept in separate containers.

Also a namespace can be nested.Sometime A namespace can all but have just another namespace,without any class.so to access a class you need to qualify the full namespace before you can use it.

In your case you use different classes ,which are on different containers.So if you need them you need to qualify them with their namespace.