How is the using() pattern useful? What is IDisposable? How does it support det

How is the using() pattern useful? What is IDisposable? How
does it support deterministic finalization?

Question Posted / gvsk

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How is the using() pattern useful? What is IDisposable? How does it support deterministic finalizat..

Answer / chirantan

The using statement defines a scope at the end of which an
object will be disposed.

How to use
using (expression | type identifier = initializer) statement
where:

expression
An expression you want to call Dispose on upon exiting the
using statement.

type
The type of identifier.

identifier
The name, or identifier, of the type type. It is possible
to define more than one identifier of type type. Precede
each identifier = initializer with a comma.

initializer
An expression that creates an object.

statement
The embedded statement or statements to executed.

You create an instance in a using statement to ensure that
Dispose is called on the object when the using statement is
exited. A using statement can be exited either when the end
of the using statement is reached or if, for example, an
exception is thrown and control leaves the statement block
before the end of the statement.

The object you instantiate must implement the
System.IDisposable interface.

Example
// cs_using_statement.cs
// compile with /reference:System.Drawing.dll
using System.Drawing;
class a
{
public static void Main()
{
using (Font MyFont = new Font("Arial", 10.0f),
MyFont2 = new Font("Arial", 10.0f))
{
// use MyFont and MyFont2
} // compiler will call Dispose on MyFont and
MyFont2

Font MyFont3 = new Font("Arial", 10.0f);
using (MyFont3)
{
// use MyFont3
} // compiler will call Dispose on MyFont3

}
}
Reference Link: http://msdn2.microsoft.com/en-
us/library/yh598w02(VS.71).aspx

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