zedgraph怎恶搞啊

[weixin_42249159]

我的这个程序代码哪里有问题啊，为什么不显示图像，efc是最小二乘法的曲线弥合，还有怎么添加第三条y轴啊，求大神，谢谢
PointPairList list1 = new PointPairList();
PointPairList list2 = new PointPairList();
efc efc1 = new efc();
double[]x = {9.57,13.519,18.627,22.473,25,529 };
double[] y = {11.36,16.06,21,62,26.29,30.19 };
double[] f = efc1.MultiLine(x,y ,5, 1);
textBox4.Text = f[0].ToString();
for (double i = 9; i < 25; i++)
{
double t = f[0] + f[1] *( i);
list1.Add(i,t);
}