C# - How is this technique called?
<p>I was wondering if this technique has a name - changing state methods to return this, to be able to write them in the linq way <code>method().method().method()</code>. </p>

<pre><code>class Program
{
    static void Main(string[] args)
    {
        Test t = new Test();
        t.Add(1).Write().Add(2).Write().Add(3).Write().Add(4).Write().Subtract(2).Write();
    }
}

internal class Test
{
    private int i = 0;

    public Test Add(int j)
    {
        i += j;
        return this;
    }

    public Test Subtract(int j)
    {
        i -= j;
        return this;
    }

    public Test Write()
    {
        Console.WriteLine("i = {0}",i.ToString());
        return this;
    }
}
</code></pre>
