Use the Show Alignment Hairs command from the Options menu to control the display of fine alignment lines on your form. When alignment hairs are displayed, a window margin is drawn on your form and alignment lines are displayed when you move or resize controls by dragging them with the mouse.
The window margin is not displayed for a Web form.
To toggle the display of alignment hairs on your form, perform one of the following actions
Select the Show Alignment Hairs command from the Options menu
Click the Alignment Hairs toolbar button
For details and an example, see "Using Alignment Hairs to Position Controls on Forms", earlier in this chapter.