There have been a few places where you can see this command run, but I wanted to talk about it here officially.  This command is used to display all of the exceptions that are currently in the managed heap.  One interesting thing is that this function actually looks at what class the object derives from and if it derives from System.Exception, then it will show up in the list.  So you can have your own custom exceptions shown here regardless of what naming mechanism you use for your class. There is some helpful information about the output from this command here: ASP.NET Debugging – ASP.NET Tips- DumpAllExceptions , namely that if you run it twice, you may see different callstacks from the various exceptions. Here is the documentation…(read more)