{try{ m_nCurrentRowIndex =0;stringcommandText ="Select * from "+"(Select LineNodeID as LineID,X1 as PX1,Y1 as PY1,X2 as PX2,Y2 as PY2,-1 from LineNodeEx Where EntityID=-1 "+"union Select LineNodeID as LineID,X2 as PX1,Y2 as PY1,X1 as PX2,Y1 as PY2,1 from LineNo...