Variable references are evaluated during run time. When a variable is defined for an EXEC statement or block, Net. Data runs the specified action when it reads the variable reference. You can dynamically generate a variable reference by including variable references, strings, and function calls within a variable reference. If you reference a dynamcially-generated variable that does not follow the variable name rules, Net.
Data resolves the reference to an empty string.
If your data source returns data containing the NULL character, Net. Data will terminate the string stored in the variable at that point in the data stream. Variable references cannot be used as an OUT parameter to a function call. Leading and trailing whitespace is ignored. A variable reference returns an empty string if any whitespace exists within the name of the variable.