In the event that you have an X-axis that has a valuetype of DateTime, and you want to convert the X-Axis DateTime to a double, here is how to do this. It was not in the documentation.
There is a method called
TimeString which accepts two parameters
- double valueAtAxis
string FormatStringTime
chart.ViewXY.XAxes[0].TimeString(cursor.ValueAtXAxis, "hh:mm:ss.fff");
Hope this helps