How to: Undo a Checkout
Visual SourceSafe's Undo Check Out command allows you to revert a Check Out operation for a database file or project. Any changes you have made to the local copy of the file or project are lost.
To revert a checkout:
In Visual SourceSafe Explorer, click the checked-out item(s).
On the Versions menu, click Undo Check Out.
In the Undo Check Out for <name> dialog box, select the appropriate options.