基于Flowportal.Net写自己的应用时使用SqlDataReader遇到的一个问题

       private void RMA_WarehouseRC_AutoPickupAndApprove()
       {
           GlobalFunction gf = new GlobalFunction();
           //Sql - Get the BPM Request list
           string strsql = "SELECT *";
           strsql += " FROM dbo.BPMInstProcSteps";
           strsql += " where ProcessName = N'RMA' and NodeName = N'Warehouse RC' and FinishAt is null";
           //Share Task
           strsql += " and Share=1";
           //Not Picked up
           strsql += " and OwnerAccount is Null";
           strsql += " Order by TaskID Asc";
           //Search the BPMDB
           SqlConnection connBPMDB = new SqlConnection(ConfigurationManager.ConnectionStrings["BPMDBConnectionString"].ConnectionString);
           SqlCommand mycmd = new SqlCommand(strsql, connBPMDB);
           mycmd.CommandType = CommandType.Text;
           connBPMDB.Open();
           //SqlDataReader drtemp = mycmd.ExecuteReader();
           SqlDataAdapter da = new SqlDataAdapter();
           DataSet ds = new DataSet();
           da.SelectCommand = mycmd;
           da.Fill(ds);
           DataTable dt = new DataTable();
           dt = ds.Tables[0];
           connBPMDB.Close();
           for (int i = 0; i < dt.Rows.Count; i++)
           {
               //Get the Warehouse Receivied Status from ERP LN
               //This update using MSSQL job to update the data
               //Database: WAIBPM 
               //Table: FormRMA
               //Data field: WarehouseReceived
               //Pickup and approve
               if (gf.testread("Select ID from FormRMA where WarehouseReceived = N'Yes' and TaskID= " + Convert.ToInt32(dt.Rows[i]["TaskID"]) + ""))
               {
                   PickupShareTaskandApprove(Convert.ToInt32(dt.Rows[i]["StepID"]));
               }
               //Pickup only
               else
               {
                   PickupShareTask(Convert.ToInt32(dt.Rows[i]["StepID"]));
               }
           }
       }