TagAttribute

The method parameter or field represents an error source tag in the form "TYPE.MEMBER", where TYPE refers to the name of the enclosing type (not including the namespace) and MEMBER refers to the name of the surrounding member.

Error source tags are used as a minimalistic stacktrace facility which is always available. Native stack-traces may be unavailable in certain situations, for example optimized RELEASE builds in C++ or obfuscated C# assemblies.