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	stwalkerster
	Jun 15 2016, 2:55 AM

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	// Let's have a class. It's sealed for some reason so we can't extend it.
	public sealed class Foo
	{
	// This class has two properties, but has nothing useful here.
	public int Value1 {get;set;}
	public int Value2 {get;set;}
	}


	// let's say I want to add the two numbers together. Because this is a Complicated Operation (tm), I'm gonna write an extension method to do it.


	public static class HandyStuff
	{
	public static int SumThings(this Foo x)
	{
	return x.Value1 + x.Value2;
	}
	}

	// let's get an instance...
	var foo = new Foo { Value1 = 3, Value2 = 4 };

	// Now, I can do stuff like this:
	var result = foo.SumThings();

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