LINQ-compatible streaming I/O helper

When reading some of the Wide Finder implementations, I come across with Don Box's approach. Besides the Wide Finder problem (be sure to look for this and other languages implementations), he gave us a nice clean generator based ReadLinesFromFile implementation. Here it is:

//  LINQ-compatible streaming I/O helper     
public static IEnumerable<string> ReadLinesFromFile(string filename)
{
    using (StreamReader reader = new StreamReader(filename))
    { 
        while (true)
        { 
            string s = reader.ReadLine();
 
            if (s == null)                
                break; 
            yield return s; 
        }
    } 
}