Populate a DataRow in a Dataset within Orchestration

Hi,

I am trying to send a DataSet to a webservice, with 1 table and 1 row and 1 column.

I try this, but it does not work, it does not like this section: SetWaitingStatusDT.Rows[0][0] = 3;

SetWaitingStatusDT = new System.Data.DataTable(“SetStatus”);
SetWaitingStatusDT.Columns.Add(“ExportStatus”);
SetWaitingStatusDT.Rows.Add(new System.Object[0] );
SetWaitingStatusDT.Rows[0][0] = 3;

// 3 means Success
SetWaitingStatusDS.Tables.Add(SetWaitingStatusDT);

MsgSetWaitingRecordsStatusRequest.pServiceName = ServiceNameSetStatus;
MsgSetWaitingRecordsStatusRequest.pServiceParams = new System.Data.DataSet();

Also the exprssion editer never likes this way

 SetWaitingStatusDT.Rows.Add(new object[] {3} );

Why ?