| Debug | Trace |
| It uses the Debug class. | It uses the Trace class. |
| It uses the time of application development. | It uses the time of application deployment. |
| It works only in debug mode. | It works in both case debug and release mode. |
| It can be used Debug.Write() method for debug. | It can be used to Trace.Write() method for trace. |
| It runs in the same thread as main program executes. | It runs in different thread form main program execute thread. |
| It is used to find errors in the program. | It is used for testing and optimization even after an application is compiled and released. |
