Get “Internal error in the expression evaluator” on “Add watch” function when trying to debug WCF service code (MSVS 2013)

Question

Few days ago I moved my solution to MSVS 2013. It works fine except one thing: when I trying to debug code of my WCF service it works, but when I want to watch state of any

Answer 1

According to question "Internal error in the expression evaluator" 'Use Managed Compatibility Mode' stops "Edit & Continue". Try to check "Use the legacy C# and VB expression evaluators" option under Tools - Options - Debugging.