Consuming Web service in .net problem accessing dataset obje

Hi All,
I am new to progress. I have issue accessing the dataset object which created in progress web service.
Kindly find the below coding

define temp-table tMember no-undo 
field MemberId AS INT
field EngName AS CHAR
define input parameter pRelationId as integer no-undo.
define dataset dsMem for tMember.
define data-source srcMem for tMember. 
define output parameter dataset for dsMem.
define query qMem for tMember.


create tMember.
ASSIGN tMember.MemberId = memberid.
ASSIGN tMember.EngName = memname.


BUFFER tMember:ATTACH-DATA-SOURCE(DATA-SOURCE srcMem:HANDLE,?,?).
QUERY qMem:QUERY-PREPARE("FOR EACH tMember").
DATASET dsMem:FILL().

I have tested this code in SOAPUI. it is working fine.
but when I try to access it in .net.. I couldn't. see the below code in .net
Let me know how to access the dataset in .net..

System.Int32? intRelID;
localhost.GetMemTestService srv = new localhost.MemTestService();
lblResult.Text = srv.GetMemTest(intRelID.Value, out strResult);
lblResult.Text = strResult;