How to use using in C #

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The usage of using:

1. Using directive: introduce namespaces

This is the most common usage, such as:

Using System;using Namespace1.SubNameSpace

2. Using static directive: specifies the type whose static members can be accessed without specifying a type name

Using static System.Math;var = PI; / / use System.Math.PI directly

3. Give an alias

Using Project = PC.MyCompany.Project

4. Using statement: bind the instance to the code

Using (Font font3 = new Font ("Arial", 10.0f), font4 = new Font ("Arial", 10.0f)) {/ / Use font3 and font4. }

At the end of the code snippet, the Dispose methods of font3 and font4 are automatically called to release the instance.

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