CodeRush Classic shows the Duplicate code code issue if two or more code parts implement the same logic.
The code issue appears automatically if the Use real time duplicate code analysis option on the Editor|Code Analysis|Duplicate Code options page is enabled. Otherwise, CodeRush Classic shows the Duplicate code code issue only after you perform a duplicate code search via the DDC - Duplicate Detection and Consolidation tool window.
Extract code from multiple locations into a single method.
Highlights duplicate code blocks, which can be consolidated to make the code more readable and clear.