Hi I use extension by reference to OutSystems.RuntimePublic.Db library. This is my code:

using (Command cmd = trans.CreateCommand())

{

.....

//add return value

                        var resultvalue = cmd.CreateParameter("value1"); 

                        resultvalue.GetDriverParameter().Direction = ParameterDirection.ReturnValue;

                        resultvalue.DbType = DbType.String;

....}

cmd.CreateParameter(string name) must have a parameter name.  I use fake parameter "value1" in the constructor but it doesn't work. 

Does anyone have idea how to write return value code here?