Was working asp.net C# code needs to be fixed

I program in .php mostly. My ex-programmer employee worked in asp.net C# I laid her off unexpectedly and she left about a hundred files, that WERE WORKING, not working. It could have been sabotage, but I don't think so. She was in the middle of converting them to accepting cookies. Hopefully, someone who knows C# should be able to get several of the more important files working again without too much work.