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C#

using


The using keyword has two major uses: As a directive, when it is used to create an alias for a namespace or to import types defined in other namespaces. See using Directive. As a statement, when it defines a scope at the end of which an object will be disposed.

Syntax:
using package;


Example:

using System;
using System.Text;

class Program
{
    static void Main()
    {
	// Use using statement with class that implements Dispose.
	using (SystemResource resource = new SystemResource())
	{
	    Console.WriteLine(1);
	}
	Console.WriteLine(2);
    }
}

class SystemResource : IDisposable
{
    public void Dispose()
    {
	// The implementation of this method not described here.
	// ... For now, just report the call.
	Console.WriteLine(0);
    }
}

Output

1
0
2


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