[Property] Direction [Description] 
A specification for whether the parameter value is being passed to the command or back: Input - the value is being passed to the command. This is the default. Output - the value is being passed back from a stored procedure. (Not applicable for SQL statements.) InputOutput - the value is passed to a stored procedure and passed back, usually with a modified value. ReturnValue - the value is an explicit return value. By default, the returned value is the first item (index value zero) in the parameters collection.