This type or member supports the Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code. For a description of this member, see IsReadOnly.
Assembly: PresentationFramework (in PresentationFramework.dll)
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.