Use using operator in C #

Aren't many people using the use operator in C #? Don't even know?
In fact, this operator is very useful in small.

As explained in MSDN
HTTP://MSDN2.MICROSOFT.COM/ZH-CN/LIBRARY/YH598W02 (vs.80). aspx
The Using keyword is also used to create a using statement that defines when the object will be disposed

You can give an example
Class Demo:idisposable
{
public void Dispose ()
{
Console.WriteLine ("Dispose");
}

public void DemoMethod ()
{
Console.WriteLine ("Hi");
}
};

Using (Demo a = new demo ())
{
A.demomethod ();
}
You can see that the Dispose () method is also executed at the same time, so the convenience is self-evident

Specific examples, you can refer to the PetShop 4.0 SQLHelper.cs