July 28, 2014For apps that target Windows Phone OS 7.0 and 7.1, do not use any members of this type in your app. If you do, your code will throw a MethodAccessException. This type is security-critical, which restricts it to internal use by the .NET Framework for Windows Phone class library.
[SECURITY CRITICAL]Namespace: System.Runtime.InteropServices
Gets a value indicating whether the handle is closed.
Assembly: mscorlib (in mscorlib.dll)