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Reality V15.2 Online Documentation (MoTW) Revision 3
%Null Special Method (databasic_sp_method_null.htm)
This method is used with a connection object to create a reference to a null object.
%Null()
Cell->setBackgroundColor(%Null())
Call the setBackgroundColor method passing a null object reference.
The above statement is equivalent to the Java syntax:
Cell.setBackgroundColor(null)
An alternative to %Null() is to use the object cast on numeric zero - (object)0.