In C#, System.Diagnostics.Debug.Write outputs to the Visual Studio Output window when debugging. However, it is invisible when compiling with csc without using Visual Studio.
To see the Debug.Write output when using csc, add a TraceListener to the Debug.Listeners collection. This will allow you to specify where Debug.WriteLine calls should output.
Another potential issue is that the Visual Studio option "Redirect all Output Window text to the Immediate Window" may prevent output from appearing in the Output window. You can disable this by unchecking the box under "Tools" → "Options" → "Debugging" → "General". Ensure "Show All Settings" is checked under "Tools" → "Options" to access this menu.
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