I have a class with two properties, say

```
public class Book {
public string TitleSource { get; set; }
public string TitleTarget { get; set; }
}

```

I have an `IList<Book>` where the `TitleTarget` is null and for each item in the list, I need to copy the `TitleSource` property to the `TitleTarget` property. I could do this through a loop, sure, but it seems like there's a LINQ or nice declarative way to do this. Is there?