如何在C#winform中实现类似功能，代码应该怎么改

如何在C#winform中实现类似功能，代码应该怎么改

let limitLine = ChartLimitLine(limit: 77, label: "优秀");
Chart1.leftAxis.addLimitLine(limitLine);

https://www.cnblogs.com/akagreen/p/10335091.html
https://social.msdn.microsoft.com/Forums/en-US/05cc70d2-c569-41b4-95b8-508b01e539a3/c20013chart2551120214229142030928155211523674121161303403568631?forum=visualcshartzhchs