```
<Root>
    <Sub>
        <Name>a</Name>
        <Value>1</Value>
    </Sub>
    <Sub>
        <Name>b</Name>
        <Value>2</Value>
    </Sub>
</Root>

```

How do I select the value of the `Value` element dependent upon the `Name` element?

Edit: In an XDocument, how do I get the value "1" when I have "a".