Value Property

Gets/sets the value for this point at a particular index. A single point can hold up to four numeric values (indexed 0–3).

Read-write property

Public Property Value(ByVal Index As Long) As Double

double value = point.Value[index];
point.Value[index] = 123.45;

Index (Long) — Zero-based index to one of the up to four values stored for the point (valid values: 0..3).

A point can contain up to four values indexed from 0 to 3. Which index values are used depends on the series type:
Index 0: Primary value used by almost all series (for example, Bar).
Index 1: Second value used by Bubble or RangeBar series.
Index 2: Opening value (e.g., for CandleStick or HighLow series).
Index 3: Closing value (e.g., for CandleStick or HighLow series).
Many series use only Index 0. You may store data in other indexes for later use, but those values will be ignored unless the series type reads them.
This is the default property for the point. In languages like VB6 the default property may be accessed without naming it explicitly; in C# you must reference the Value property (for example, point.Value[0]).