The output window is useful for debugging where breakpoints would be too invasive or interrupt flow but it’s pretty noisy.
Just right-click in the output window (make sure output is set to debug) and turn off the Module Load, Module Unload, Process Exit and Thread Exit to leave you with stuff you actually care about. Now you can use Debug.WriteLine() to write any output to Output Window.
You can also press CtrlS in the output window to save the contents.