How can a guideline be included in the Visual Studio editor?

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To include a guideline in the Visual Studio editor, follow these steps:

1. Open the Visual Studio editor.
2. Right-click on the vertical ruler to the left of the code editor window.
3. Select "Add Guideline".
4. Enter the exact position or percentage where you want the guideline to appear.
5. Choose a color and style for the guideline from the options provided.
6. Click "OK".

The guideline will now appear as a colored line on the vertical ruler and will help you align your code consistently, making it easier to read and understand.