Assembly: System.Web (in system.web.dll)
webPart is a null reference (Nothing in Visual Basic).
The current display mode on the page is not EditDisplayMode.
webPart is closed.
- or -
webPart is not part of the Controls collection.
webPart is equal to the SelectedWebPart control.
The BeginWebPartEditing method exists so that the process of editing controls can be done in distinct stages, giving developers more control over the process. The method performs a set of initial checks to ensure that webPart is in a state where it can be edited. If webPart passes all the checks, it is then set as the currently selected control (see the SelectedWebPart property), and the editing process can continue.
Windows 98, Windows 2000 SP4, Windows Millennium Edition, 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.