StartupPosition

The initial position of a form's window when it is first shown. Used by WindowsFormOptions.StartUpPosition. Honoured once, at the form's first display; subsequent moves are at the user's discretion or controlled by code.

Constant	Value	Description
tbStartUpManual	0	The form uses its design-time Left and Top values.
tbStartUpCenterOwner	1	The form is centred over its owner window. Falls back to tbStartUpCenterScreen if the form has no owner.
tbStartUpCenterScreen	2	The form is centred on the screen.
tbStartUpWindowsDefault	3	Windows chooses the position using the same cascade-from-top-left logic the OS applies to new windows. The default for newly-constructed WindowsFormOptions.