mysql - Invalid Attempt to access field before read -


i have been beating head on morning , know it's simple thing i'm missing. code breaking @ dr.getstring(1).tostring line error "invalid attempt access field before calling read(). know sql statement works fine in workbench i'm thinking has messed parameter, it's not erroring out there.

dim cs new mysqlconnection("server=10.1.1.1;persist security info=true;database=db;uid=uid;password=pw")     dim ds string = cs.datasource     dim cn mysqlconnection = new mysqlconnection     cn.connectionstring = "user id=uid;password=pw!;database=db;data source=" + ds     dim sql string = "select a.email, b.details, b.requestor, b.id department a, workrequest b a.name = b.department , b.approval null , b.status != @stat"     dim cmd new mysqlcommand(sql, cn)     cmd.parameters.add("@stat", mysqldbtype.varchar).value = "closed"     cn.open()     dim dr mysqldatareader     dr = cmd.executereader      dim integer = 0      while dr.read() or < 20         'dim email string = dr.getstring(0).tostring         dim email string = "test@dom.an"         dim details string = dr.getstring(1).tostring         dim requestor string = dr.getstring(2).tostring         dim workid string = dr.getstring(3).tostring          try             sendsmtp("test.dom.am", email, "work request awaiting approval", "<body><b>work request number:</b> " & workid & "</br><b> referring to: </b></br> " & details & "</br><b>submitted by: </b> " & requestor & "</br> waiting approval.  please go http://test.dom.an view , approve or deny request</body>", "test.dom.an", "")          catch ex exception          end try          = + 1     end while     me.close()


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