Redo, Undo Commands (Edit Menu)
Undoreverses the last editing action, such as typing text in the code editor or deleting controls. When you delete one or more controls, you can use the Undo command to restore the controls and all their properties except for the TabIndex property, which cannot be restored. TabIndex is reset to the end of the Tab order when using Undo. For forms, Undo is unavailable if the form has been edited since the last control deletion.
Keyboard shortcut: Ctrl+Z.
Redorestores the last text editing Undo actions if no other actions occur since the last Undo.
Keyboard shortcut: Ctrl+Backspace.
For text edits, you can use Undo and Redo to restore up to twenty editing actions.
These commands are unavailable if there was no previous editing action, or if any other action has been performed after the last editing action.
Chapter 1, "Introduction"