Diagnostic Messages in the Output Window
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You can write run-time messages to the Output window using the Debug class or the Trace class, which are part of the System.Diagnostics class library. Use the Debug class if you only output in the Debug version of your program. Use the Trace class if you want output in both the Debug and Release versions.
Various Write methods, which output information without breaking execution. These methods replace the Debug.Print method used in previous versions of Visual Basic.
Debug.Assert and Trace.Assert methods, which break execution and outputs information if a specified condition fails. By default, the Assert method displays the information in a dialog box. For more information, see Assertions in Managed Code.
In addition to program out from your application, the Output window can display the information about:
Modules the debugger has loaded or unloaded.
Exceptions that are thrown.
Processes that exit.
Threads that exit.