The string calculator with Xamarin Studio on Win7 box. Let's see.  => 0 : red
 => 0 : green
decided to go for osherove style naming (although I don't like it) in honor of 'his' kata : blue
1 => 1 : red
1 => 1 : green
2 => 2 : red
2 => 2 : green
2,2 => 4 : red
2,2 => 4 : green
2LF2 => 4 : red
2LF2 => 4 : green
DELIMIT;2;2 => 4 : red
DELIMIT;2;2 => 4 : green
-x => exception : red
-x => exception : green
touchdown. a short and nice string calculator with usage of linq. XS is nice and fast, but I prefer the vanilla MD version more. apart of that th editor behavior is subject to get used to.