Assembly: System.Design (in system.design.dll)
Because the UsePreviewControl property is always true, the designer ViewControl property returns a copy of the associated Login control to generate the design-time markup. The ViewControl property creates the copy by persisting the actual Login control, then parsing the persisted control string. The copied control does not affect any persistence for the Login.
If the UsePreviewControl property has been overridden to return false, the designer uses the associated Login itself to generate the design-time markup, and design-time changes to the control will persist to the page markup source.Notes to Inheritors You can override the UsePreviewControl property to return false or to determine its value based on whether the control is marked with a class-level SupportsPreviewControlAttribute attribute. If the UsePreviewControl is not overridden, the Login control ignores the SupportsPreviewControlAttribute.
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.