[PersistenceMode(PersistenceMode.InnerProperty)]
[XtraChartsLocalizableCategory(XtraChartsCategory.Data)]
public NumericSummaryOptions NumericSummaryOptions { get; }

<XtraChartsLocalizableCategory(XtraChartsCategory.Data)>
<PersistenceMode(PersistenceMode.InnerProperty)>
Public ReadOnly Property NumericSummaryOptions As NumericSummaryOptions

using DevExpress.XtraCharts;
using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace SummaryChart {

        private void OnLoad(object sender, EventArgs e) {

            // Create a series.                
            Series series = new Series("Series", ViewType.Point);

            // Create a summary data adapter.
            SummaryDataAdapter dataAdapter = new SummaryDataAdapter();

            // Specify the data source.
            dataAdapter.DataSource = DataPoint.GetDataPoints();

            // Create a data member that defines arguments.
            dataAdapter.DataMembers.Add(new DataMember {
                DataMemberType = ChartDataMemberType.Argument,
                ColumnName = "Argument",
                ScaleType = ScaleType.Numerical
            });
            // Create a data member that defines values.
            dataAdapter.DataMembers.Add(new DataMember {
                DataMemberType = ChartDataMemberType.Value,
                ColumnName = "Value",
                ScaleType = ScaleType.Numerical
            });

            // Specify a summary function.
            dataAdapter.NumericSummaryOptions.SummaryFunction = "SUM([Value])";

            // Assign the data adapter to the series.
            series.DataAdapter = dataAdapter;

            // Add the series to the chart.
            chart.Series.Add(series);

        }

        public class DataPoint {
            public double Argument { get; set; }
            public double Value { get; set; }
            public static List<DataPoint> GetDataPoints() {
                return new List<DataPoint> {
                    new DataPoint { Argument= 1, Value = 853D},
                    new DataPoint { Argument= 1, Value = 321D},
                    new DataPoint { Argument= 1, Value = 655D},
                    new DataPoint { Argument= 1, Value = 1325D},
                    new DataPoint { Argument= 2, Value = 653D},
                    new DataPoint { Argument= 2, Value = 172D},
                    new DataPoint { Argument= 2, Value = 255D},
                    new DataPoint { Argument= 3, Value = 981D},
                    new DataPoint { Argument= 3, Value = 913D},
                    new DataPoint { Argument= 4, Value = 123D},
                    new DataPoint { Argument= 4, Value = 1011D},
                    new DataPoint { Argument= 4, Value = 359D},
                    new DataPoint { Argument= 4, Value = 721D},
                    new DataPoint { Argument= 4, Value = 565D}
                };
            }
        }
    }
}

Imports DevExpress.XtraCharts
Imports System
Imports System.Collections.Generic
Imports System.Windows.Forms

Namespace SummaryChart
    Private Sub OnLoad(ByVal sender As Object, ByVal e As EventArgs)
        ' Create a series.   
        Dim series As Series = New Series("Series", ViewType.Point)
        ' Create a summary data adapter.
        Dim dataAdapter As SummaryDataAdapter = New SummaryDataAdapter()
        ' Specify the data source.
        dataAdapter.DataSource = DataPoint.GetDataPoints()
        ' Create a data member that defines arguments.
        dataAdapter.DataMembers.Add(New DataMember With {
            .DataMemberType = ChartDataMemberType.Argument,
            .ColumnName = "Argument",
            .ScaleType = ScaleType.Numerical
        })
        ' Create a data member that defines values.
        dataAdapter.DataMembers.Add(New DataMember With {
            .DataMemberType = ChartDataMemberType.Value,
            .ColumnName = "Value",
            .ScaleType = ScaleType.Numerical
        })
        ' Specify a summary function.
        dataAdapter.NumericSummaryOptions.SummaryFunction = "SUM([Value])"
        ' Assign the data adapter to the series.
        series.DataAdapter = dataAdapter
        ' Add the series to the chart.
        chart.Series.Add(series)
    End Sub

    Public Class DataPoint
        Public Property Argument As Double
        Public Property Value As Double

        Public Shared Function GetDataPoints() As List(Of DataPoint)
            Return New List(Of DataPoint) From {
                New DataPoint With {
                    .Argument = 1,
                    .Value = 853R
                },
                New DataPoint With {
                    .Argument = 1,
                    .Value = 321R
                },
                New DataPoint With {
                    .Argument = 1,
                    .Value = 655R
                },
                New DataPoint With {
                    .Argument = 1,
                    .Value = 1325R
                },
                New DataPoint With {
                    .Argument = 2,
                    .Value = 653R
                },
                New DataPoint With {
                    .Argument = 2,
                    .Value = 172R
                },
                New DataPoint With {
                    .Argument = 2,
                    .Value = 255R
                },
                New DataPoint With {
                    .Argument = 3,
                    .Value = 981R
                },
                New DataPoint With {
                    .Argument = 3,
                    .Value = 913R
                },
                New DataPoint With {
                    .Argument = 4,
                    .Value = 123R
                },
                New DataPoint With {
                    .Argument = 4,
                    .Value = 1011R
                },
                New DataPoint With {
                    .Argument = 4,
                    .Value = 359R
                },
                New DataPoint With {
                    .Argument = 4,
                    .Value = 721R
                },
                New DataPoint With {
                    .Argument = 4,
                    .Value = 565R
                }
            }
        End Function
    End Class
End Namespace