A string that is used with UnmanagedType.CustomMarshaler to hold a cookie that is passed to the custom marshaler. The value of the cookie is defined by the custom marshaler implementation.
This field is used only with UnmanagedType.CustomMarshaler and is optional.
Namespace: System.Runtime.InteropServices
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0