What is different? "Using" in and out my namespace

Question

My english isn't very good.

Hi :), a few days ago I searched something, and I found a code on msdn, where was "using" in namespace. Why they make this?

Answer 1

Maybe you can Google the answer
I'll check

Answer 2

the answer is at this link

https://en.m.wikipedia.org/wiki/Namespace
Namespace - Wikipedia

Answer 3

@okezie I checked, but i don't understand

Answer 4

I know what is namespace, but why they use in using in another namespace

Answer 5

do you speak English

Answer 6

if you don't speak English write it in your language I'll translate it.
I don't understand what you are saying

Answer 7

this is a part of code, but this is what i try to say

// events1.cs
using System;
namespace MyCollections
{
using System.Collections;

https://msdn.microsoft.com/en-us/library/aa645739(v=vs.71).aspx