1.清空Zedgraph所有曲线
zedGraphControl2.GraphPane.CurveList.Clear();
2.清空某一条曲线
lItemCur = zedGraphControl2.GraphPane.AddCurve("", pplistCur, pb.BackColor, SymbolType.None);
zedGraphControl2.GraphPane.CurveList.Remove(lItemCur);
3.某条曲线可见与不可见
CheckBox[] cb = { cbCurve1, cbCurve2, cbCurve3, cbCurve4, cbCurve5 };
lItemCur[i].IsVisible = cb[i].Checked;
zedGraphControl2.AxisChange();/*加上此句，可见的曲线Y轴值跟随可见曲线的最大值与最小值变化*/
4.曲线是圆滑曲线
myCurve.Line.IsAntiAlias = true;
myCurve.Line.IsSmooth = true;
myCurve.Line.SmoothTension = 0.5F;
5.通过修改相关代码实现