ParameterDirection
Specifies the type of a parameter within a query relative to the DataSet.
Input = 1
The parameter is an input parameter.
InputOutput = 3
The parameter is capable of both input and output.
Output = 2
The parameter is an output parameter.
ReturnValue = 6
The parameter represents a return value from an operation such as a stored procedure, built-in function, or user-defined function.