dotfuscator StackViewer

Visual Studio comes with Dotfuscator Community Edition - a free tool to obfuscate .NET binaries.

The gotcha is if a user sends you an exception with stack trace from your dotfuscated application, you need the full version of Dotfuscator to view it. DFStack is a cheaper option, but it wouldn't work consistently for me, and theres no source code available.

So heres a free open-source obfuscated stack decoder.