Test the null setting for the given field

The Schema.Field objects used to set and get Tuple field values must be obtained via the Tuple's Schema object. A Schema.Field object that has been created by the user or retrieved from a different Schema may not work.

public virtual bool IsNull(
	Schema..::..Field field
)

Public Overridable Function IsNull ( _
	field As Schema..::..Field _
) As Boolean

public:
virtual bool IsNull(
	Schema..::..Field^ field
)