Is there a way to debug an already running application compiled in release mode?
Ignore the "no symbols" warning. Once you plug in the built-in debugger (I prefer WinDbg for this kind of thing), download the SoS tools package:
.loadby sos mscorwks
You can now get the managed column using the command !clrstack
, and hopefully this gives you enough information to figure out what is going on. Here's a handy cheat sheet with a few others if that doesn't do it for you.
It won't help you this time, but ... get in the habit of enabling symbol file generation for debug build and release. There is no reason not to do this, and it will make your life easier in these situations.
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Here is sample code, links to tools, and presentations on how to debug a proven .NET process .
You will probably also want to watch this video presentation , which features the same tools and samples. Despite the Swedish text on the webpage, the video is in English.
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