For the starter I thank you for this great Kata, it is fun and challenging.
And of course I admit, my code is still messy to tackle this Kata very efficiently.
And it get me curious that even though I've tested my code in VS, and generate possible integer-question to test the code, and obviously it checked out,but
whether I tried to apply full test, it always 'Time Out', so i get some thinking that if it's really because of my code or because my account is free so server related stuff..

Maybe because it just import System Namespace, my sugestion is, just using 'String.Replace'Method (shoal.Replace(old, new))

Count() is an aggregate function function, so you should add GROUP BY statement to use it