Assembly: System.Design (in system.design.dll)
The WebPartManagerDesigner class provides a bare-minimum design-time rendering of the WebPartManager control. It appears on the design surface as a plain gray box showing the name of the class and the ID of the current WebPartManager. You can change the rendering of a custom WebPartManager control by overriding the GetDesignTimeHtml method in the same manner as with any standard ControlDesigner. The UsePreviewControl property is overridden to always return true.
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.