chaining the C# ?? Operator

?? operator was news to me, Rick Stahl's blog is great: http://www.west-wind.com/weblog/posts/236298.aspx. snippet:

string value1 = null;
string value2 = "Test1";
string result = value1 != null ? value1 : value2;

which causes result containing Test1 or the second value.

In C# you can shortcut this special null comparison case with the new ??:

string result = value1 ?? value2;