Gets a list of ContentPlaceHolder controls that the master page uses to define different content regions.
Assembly: System.Web (in System.Web.dll)
Derived master page classes access the property to list the current ContentPlaceHolder controls that are contained by the master. Derived types do not typically override the property.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.