Question

I am using MSChart and I am creating array like this

DataPoint[] datapoint = new DataPoint[10];
datapoint[0].SetValueY(86);

but it is giving error

NullReferenceException: Object
reference not set to an instance of an
object.

Why is it giving error?

Answer 1

Your array initially contains 10 null references. You have to populate it with actual object references before using it. Try something like:

DataPoint[] datapoint = new DataPoint[10];
for (int i = 0; i < datapoint.Length; ++i) {
    datapoint[i] = new DataPoint();
}

datapoint[0].SetValueY(86);