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The occurrence of compilation errors in Visual Studio can be enabled when using #if Debug... #else statements by setting the "Treat Warnings as Errors" option to "All" in the project settings. This will cause any warnings, including those generated by #if Debug... #else statements, to be treated as errors and therefore prevent the code from compiling. To enable this setting, follow these steps:

1. Open the project properties in Visual Studio by right-clicking on the project in the Solution Explorer and selecting "Properties".

2. Navigate to the "Build" tab in the properties window.

3. Set the "Treat Warnings as Errors" option to "All".

4. Save the changes to the project properties.

With this setting enabled, any code within #if Debug... #else statements that generates a warning will cause the entire code block to be treated as an error and prevent the code from compiling.