ASA Programming Guide
Adaptive Server Anywhere .NET Data Provider API Reference
AsaParameter class
A value indicating whether the parameter is input-only, output-only, bidirectional, or a stored procedure return value parameter.
ParameterDirection Direction
Read-write
If the ParameterDirection is output, and execution of the associated AsaCommand does not return a value, the AsaParameter contains a null value. After the last row from the last result set is read, Output, InputOut, and ReturnValue parameters are updated.