How to: Discard Changes Made to Diagrams
You can discard changes in your database diagram that you do not want to save in the database.
Note
The dialog boxes and menu commands you see might differ from those described in Help depending on your active settings or edition. To change your settings, choose Import and Export Settings on the Tools menu. For more information, see Visual Studio Settings.
To discard pending modifications
Close your database diagram or table design window.
A message prompts you to save your changes. Choose No.
Warning
If you have other open database diagrams or table design windows connected to the same database, close them without saving changes as well.