Assembly: System.Web (in System.Web.dll)
The method is typically used to create a ControlCollection object to store the child controls for a control. The implementation of the method for a Substitution control always returns an EmptyControlCollection object, to indicate that the Substitution control does not support child controls.Notes to Inheritors
When extending the Substitution control, you can override the method in a derived class to support child controls.
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.