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Empty Points

The data points those uses the null or undefined as value are considered as empty points. The empty data points are ignored and not plotted in the chart. You can customize those points, using the emptyPointSettings property in series. The default mode of the empty point is Gap. Other supported modes are Average and Zero.

razor
empty.cs
@using Syncfusion.EJ2;
@section ControlsSection{
 @(Html.EJS().AccumulationChart("container").Series(series =>
            {
                series.DataSource(ViewBag.dataSource)
                  .XName("xValue")
                  .YName("yValue")
                  .Name("Profit")
                  .Type(Syncfusion.EJ2.Charts.AccumulationType.Pie)
                  .DataLabel(ViewBag.datalabel)
                  .EmptyPointSettings(ViewBag.emptypoint).Add();
            })
            .EnableSmartLabels(true)
            .Title("Annual Product-Wise Profit Analysis")
            .LegendSettings(ls => ls.Visible(false))
            .Load("load").Render()
    )
}
public ActionResult Index()
        {
            List<EmptyPointsChartData> chartData = new List<EmptyPointsChartData>
            {

                new EmptyPointsChartData { xValue = "Rice",  yValue = 80   },
                new EmptyPointsChartData { xValue = "Wheat", yValue = null },
                new EmptyPointsChartData { xValue = "Oil",   yValue = 70   },
                new EmptyPointsChartData { xValue = "Corn",  yValue = 60   },
                new EmptyPointsChartData { xValue = "Gram",  yValue = null },
                new EmptyPointsChartData { xValue = "Milk",  yValue = 70   },
                new EmptyPointsChartData { xValue = "Peas",  yValue = 80   },
                new EmptyPointsChartData { xValue = "Fruit", yValue = 60   },
                new EmptyPointsChartData { xValue = "Butter",yValue = null },            

            };
            ViewBag.dataSource = chartData;      
            return View();
        }
        public class EmptyPointsChartData
        {
            public string xValue;
            public Nullable<double> yValue;
        }

Customization

Specific color for an empty point can be set by using the fill property in emptyPointSettings and the border for an empty point can be set by using the border property.

razor
custom.cs
@using Syncfusion.EJ2;
@section ControlsSection{
 @(Html.EJS().AccumulationChart("container").Series(series =>
            {
                series.DataSource(ViewBag.dataSource)
                  .XName("xValue")
                  .YName("yValue")
                  .Name("Profit")
                  .Type(Syncfusion.EJ2.Charts.AccumulationType.Pie)
                  .DataLabel(ViewBag.datalabel)
                  .EmptyPointSettings(ViewBag.emptypoint).Add();
            })
            .EnableSmartLabels(true)
            .Title("Annual Product-Wise Profit Analysis")
            .LegendSettings(ls => ls.Visible(false))
            .Load("load").Render()
    )
}
public ActionResult Index()
        {
            List<EmptyPointsChartData> chartData = new List<EmptyPointsChartData>
            {

                new EmptyPointsChartData { xValue = "Rice",  yValue = 80   },
                new EmptyPointsChartData { xValue = "Wheat", yValue = null },
                new EmptyPointsChartData { xValue = "Oil",   yValue = 70   },
                new EmptyPointsChartData { xValue = "Corn",  yValue = 60   },
                new EmptyPointsChartData { xValue = "Gram",  yValue = null },
                new EmptyPointsChartData { xValue = "Milk",  yValue = 70   },
                new EmptyPointsChartData { xValue = "Peas",  yValue = 80   },
                new EmptyPointsChartData { xValue = "Fruit", yValue = 60   },
                new EmptyPointsChartData { xValue = "Butter",yValue = null },            

            };
            ViewBag.dataSource = chartData;       
            return View();
        }
        public class EmptyPointsChartData
        {
            public string xValue;
            public Nullable<double> yValue;
        }