Creates an identifier for controls that do not have an identifier assigned.
The EnsureID method generates an identifier for controls that are contained in another control. Identifiers are generated only for controls that do not have a value assigned to the ID 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.