When debugging asp.net code (running against IIS, and using Visual studio 2013) and in a breakpoint and trying to evaluate a variable using quick watch i quite often get \"u
I have faced this for specific project and the reason is Costura.Fody (embeds all DLLs into the executing assembly).
In this case you can disable Costura.Fody.
Comment out Costura from FodyWever.xml
Disable the clean reference target (if included) in *.csproj