Overload List
| Name | Description | 
|---|---|
| IsNull(Int32) | 
Test the null setting for the nFieldIndex'th field
  | 
| IsNull(String) | 
Test the null setting for field sFieldName
  | 
| IsNull(Schema..::..Field) | 
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.
  |