|Dotfuscator > Understanding Instrumentation with Dotfuscator > Instrumentation Injection > PreEmptive Analytics Custom Attributes > Exception Tracking Attributes|
The Exception Track custom attribute is defined in
PreEmptive.Attributes.dll, which is located by default in the Dotfuscator 4 installation folder. To add the Exception Track custom attribute to an application, the developer must add a reference to this DLL and the DLL must be available at compile time. While injecting the Exception Tracking code, Dotfuscator removes references to this DLL; therefore, the DLL is not required at application runtime and does not need to be distributed with the application.
In addition to using the custom attributes DLL, the Exception Track attribute may be specified as an extended attribute using the instrumentation editor on the Dotfuscator user interface. This is useful if you do not want to modify the application source code to add custom attributes.
This section discusses the custom attribute at a high level (what it is, when and where to use it). For a programmer's reference, see the custom attribute reference.