Whether this McDBAttributeType is a valid, existing object.

A Boolean value.  

object.IsValid

The IsValid Property syntax has these parts:

The dynamic nature of database objects means it is possible, for example, through security permissions changes and/or transacactions, for McDBAttributeType objects to become “invalidated” or no longer available in the operating context. McDBAttributeType objects in this state are represented as uninitialized objects (i.e. any of an object in this state throws OLE_E_BLANK). This property returns this validity state for this McDBAttributeType. That is, this property will be True if this McDBAttributeType is a valid object, or False if it has become invalidated or made unavailable since its instantiation.