using keyword

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When an object implements the IDisposable interface, it can be created within the using syntax:

using (var foo = new Foo())
{
    // do foo stuff
} // when it reaches here foo.Dispose() will get called

public class Foo : IDisposable
{
    public void Dispose()
    {
        Console.WriteLine("dispose called");
    }
}

View demo

using is syntatic sugar for a try/finally block; the above usage would roughly translate into:

{
    var foo = new Foo();
    try
    {
        // do foo stuff
    }
    finally
    {
        if (foo != null)
            ((IDisposable)foo).Dispose();
    }
}

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