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Gets or sets the data marker size in points.
Use this property to retrieve the marker size applied to a chart point.
int MarkerSize { get; set; }
Property MarkerSize As Integer
worksheet.Range["A1:B4"].Value = new object[,] {{"Category", "Value"}, {"A", 10}, {"B", 20}, {"C", 30}};
IChart chart = worksheet.Shapes.AddChart(ChartType.LineMarkers, 20, 20, 300, 200).Chart;
chart.SeriesCollection.Add(worksheet.Range["A1:B4"]);
IPoint point = chart.SeriesCollection[0].Points[1];
point.MarkerSize = 12;
int markerSize = point.MarkerSize;