Using usage in C #

Before learning WCF wrote an example with a using () {} sentence. The original using can have other functions in addition to referencing namespaces.

Using this keyword in C # uses three uses:

1, used in the namespace such as: using System; This everyone knows, in order not to write the full name of the class (can be System.Console written Console)
2, to aclass to rename

Renaming a class is also for ease of use, such as:
Using System;
using hahaha = System.Console;
Namespace Console001
{
public class Class1
{
public static void Main ()
{
hahaha. WriteLine ("Using the second usage!") ");
}
}
}

3, Resource management statement function

c#. There are also resource management statement functions:
using (r r1 = new R ()) {
    r1. F ();
}
r r1 = new R ();
try {
   r1. F ();
}
finally {
   if (r1! = null) ((IDisposable) R1). Dispose ();
}

R1, of course, supports the Dispose () method.

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Using usage in C #