public double GridSpacing { get; set; }

Public Property GridSpacing As Double

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts" 
    x:Class="AggregationNumericData.MainWindow"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <dxc:ChartControl >
            <dxc:ChartControl.Legend>
                <dxc:Legend/>
            </dxc:ChartControl.Legend>
            <dxc:XYDiagram2D>
                <dxc:XYDiagram2D.AxisX>
                    <dxc:AxisX2D GridLinesVisible="True">
                        <dxc:AxisX2D.NumericScaleOptions>
                            <dxc:ManualNumericScaleOptions MeasureUnit="100" GridAlignment="1000" 
                                                           AggregateFunction="Maximum" GridSpacing="2"/>
                        </dxc:AxisX2D.NumericScaleOptions>
                    </dxc:AxisX2D>
                </dxc:XYDiagram2D.AxisX>
                <dxc:LineSeries2D DataSource="{Binding Path=Series}" 
                                  ArgumentDataMember="Argument" ValueDataMember="Value"/>
            </dxc:XYDiagram2D>
        </dxc:ChartControl>
    </Grid>
</Window>

Imports Microsoft.VisualBasic
Imports System
Imports System.Collections.Generic
Imports System.Windows

Namespace AggregationNumericData
    Partial Public Class MainWindow
        Inherits Window
        Public Sub New()
            InitializeComponent()
            DataContext = New AggregationDataContext()
        End Sub
    End Class

    Public Class AggregationDataContext
        Private Const pointCount As Integer = 100000

        Private ReadOnly series_Renamed As New List(Of NumericPoint)()

        Public ReadOnly Property Series() As List(Of NumericPoint)
            Get
                Return series_Renamed
            End Get
        End Property

        Public Sub New()
            FillPoints(series_Renamed)
        End Sub

        Private Sub FillPoints(ByVal series As List(Of NumericPoint))
            If series IsNot Nothing Then
                Dim value As Double = 0
                Dim argument As Double = 0
                Dim random As New Random()

                For i As Double = 0 To pointCount - 1
                    series.Add(New NumericPoint(argument, value))
                    value += (random.NextDouble() * 10.0 - 5.0)
                    argument += random.NextDouble()
                Next i
            End If
        End Sub

    End Class

    Public Class NumericPoint
        Private ReadOnly argument_Renamed As Double
        Private ReadOnly value_Renamed As Double

        Public ReadOnly Property Argument() As Double
            Get
                Return argument_Renamed
            End Get
        End Property
        Public ReadOnly Property Value() As Double
            Get
                Return value_Renamed
            End Get
        End Property

        Public Sub New(ByVal argument As Double, ByVal value As Double)
            Me.argument_Renamed = argument
            Me.value_Renamed = value
        End Sub
    End Class
End Namespace

using System;
using System.Collections.Generic;
using System.Windows;

namespace AggregationNumericData
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            DataContext = new AggregationDataContext();
        }
    }

    public class AggregationDataContext
    {
        const int pointCount = 100000;

        readonly List<NumericPoint> series = new List<NumericPoint>();

        public List<NumericPoint> Series { get { return series; } }

        public AggregationDataContext()
        {
            FillPoints(series);
        }

        void FillPoints(List<NumericPoint> series)
        {
            if (series != null)
            {
                double value = 0;
                double argument = 0;
                Random random = new Random();

                for (double i = 0; i < pointCount; i++)
                {
                    series.Add(new NumericPoint(argument, value));
                    value += (random.NextDouble() * 10.0 - 5.0);
                    argument += random.NextDouble();
                }
            }
        }

    }

    public class NumericPoint
    {
        readonly double argument;
        readonly double value;

        public double Argument { get { return argument; } }
        public double Value { get { return value; } }

        public NumericPoint(double argument, double value)
        {
            this.argument = argument;
            this.value = value;
        }
    }
}