public SeriesPoint SeriesPoint { get; }

Public ReadOnly Property SeriesPoint As SeriesPoint

using System.Windows;
using System.Windows.Input;
using DevExpress.Xpf.Charts;
using System.Text;

namespace DetermineHoveredChartElement
{

    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void chartControl1_MouseMove(object sender, MouseEventArgs e)
        {
            // Obtain hit information under the test point.
            ChartHitInfo hitInfo = chartControl1.CalcHitInfo(e.GetPosition(chartControl1));
            StringBuilder builder = new StringBuilder();

            // Check whether the chart element is under the test point and if so - obtain the element's content.
            if (hitInfo.InDiagram)
                builder.AppendLine("In diagram");
            if (hitInfo.InAxis)
                builder.AppendLine("In axis:" + hitInfo.Axis.Name);
            if (hitInfo.AxisLabel != null)
                builder.AppendLine("Axis Label:\n" + hitInfo.AxisLabel.Name);
            if (hitInfo.AxisTitle != null)
                builder.AppendLine("Axis title:\n" + hitInfo.AxisTitle.Content);
            if (hitInfo.InTitle)
                builder.AppendLine("In chart title:\n " + hitInfo.Title.Content);
            if (hitInfo.InLegend)
                builder.AppendLine("In legend");
            if (hitInfo.InSeries)
                builder.AppendLine("In series: " + hitInfo.Series.Name);
            if (hitInfo.InSeriesLabel)
            {
                builder.AppendLine("In series label");
                builder.AppendLine("Series Label:" + hitInfo.SeriesLabel.Name);
            }

            if (hitInfo.InSeriesPoint)
            {
                builder.AppendLine("Argument: " + hitInfo.SeriesPoint.Argument);
                builder.AppendLine("Value: " + hitInfo.SeriesPoint.Value);
            }

            // Show hit-testing results 
            if (builder.Length > 0)
                text1.Content = string.Format("Hit-testing results:\n" + builder.ToString());
            else
                text1.Content = "Move the mouse\n pointer over\n the chart to see\n information on\n hovered chart\n elements.";
        }
    }
}

<Window x:Class="DetermineHoveredChartElement.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" 
        xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts">

    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="130"/>
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <StackPanel Grid.Row="0" Grid.Column="0" >
            <Label Name="text1"/>
        </StackPanel>
        <dxc:ChartControl Grid.Row="0" Grid.Column="1" Name="chartControl1"
                          CrosshairEnabled="False" 
                          MouseMove="chartControl1_MouseMove">
            <dxc:XYDiagram2D >
                <dxc:BarSideBySideSeries2D x:Name="series1" LabelsVisibility="True" 
                                            DisplayName="Series1">
                    <dxc:SeriesPoint Argument="A" Value="1" />
                    <dxc:SeriesPoint Argument="B" Value="2" />
                    <dxc:SeriesPoint Argument="C" Value="3" />
                    <dxc:SeriesPoint Argument="D" Value="4" />
                </dxc:BarSideBySideSeries2D>
                <dxc:BarSideBySideSeries2D x:Name="series2" LabelsVisibility="True" 
                                           DisplayName="Series2">
                    <dxc:SeriesPoint Argument="A" Value="4" />
                    <dxc:SeriesPoint Argument="B" Value="3" />
                    <dxc:SeriesPoint Argument="C" Value="2" />
                    <dxc:SeriesPoint Argument="D" Value="1" />
                </dxc:BarSideBySideSeries2D>
                <dxc:XYDiagram2D.AxisY>
                    <dxc:AxisY2D >
                        <dxc:AxisY2D.Title>
                            <dxc:AxisTitle Content="AxisY Title"/>
                        </dxc:AxisY2D.Title>
                        <dxc:AxisY2D.Label>
                            <dxc:AxisLabel Name="AxisYLabel" />
                        </dxc:AxisY2D.Label>
                    </dxc:AxisY2D>
                </dxc:XYDiagram2D.AxisY>
                <dxc:XYDiagram2D.AxisX>
                    <dxc:AxisX2D>
                        <dxc:AxisX2D.Label>
                            <dxc:AxisLabel Name="AxisXLabel"/>
                        </dxc:AxisX2D.Label>
                    </dxc:AxisX2D>
                </dxc:XYDiagram2D.AxisX>
            </dxc:XYDiagram2D>
            <dxc:ChartControl.Titles>
                <dxc:Title Content="My Chart" />
            </dxc:ChartControl.Titles>
            <dxc:ChartControl.Legend>
                <dxc:Legend />
            </dxc:ChartControl.Legend>
        </dxc:ChartControl>
    </Grid>
</Window>

Imports Microsoft.VisualBasic
Imports System.Windows
Imports System.Windows.Input
Imports DevExpress.Xpf.Charts
Imports System.Text

Namespace DetermineHoveredChartElement

    Partial Public Class MainWindow
        Inherits Window
        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub chartControl1_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs)
            ' Obtain hit information under the test point.
            Dim hitInfo As ChartHitInfo = chartControl1.CalcHitInfo(e.GetPosition(chartControl1))
            Dim builder As New StringBuilder()

            ' Check whether the chart element is under the test point and if so - obtain the element's content.
            If hitInfo.InDiagram Then
                builder.AppendLine("In diagram")
            End If
            If hitInfo.InAxis Then
                builder.AppendLine("In axis:" & hitInfo.Axis.Name)
            End If
            If hitInfo.AxisLabel IsNot Nothing Then
                builder.AppendLine("Axis Label:" & Constants.vbLf + hitInfo.AxisLabel.Name)
            End If
            If hitInfo.AxisTitle IsNot Nothing Then
                builder.AppendLine("Axis title:" & Constants.vbLf + hitInfo.AxisTitle.Content)
            End If
            If hitInfo.InTitle Then
                builder.AppendLine("In chart title:" & Constants.vbLf & " " & hitInfo.Title.Content)
            End If
            If hitInfo.InLegend Then
                builder.AppendLine("In legend")
            End If
            If hitInfo.InSeries Then
                builder.AppendLine("In series: " & hitInfo.Series.Name)
            End If
            If hitInfo.InSeriesLabel Then
                builder.AppendLine("In series label")
                builder.AppendLine("Series Label:" & hitInfo.SeriesLabel.Name)
            End If

            If hitInfo.InSeriesPoint Then
                builder.AppendLine("Argument: " & hitInfo.SeriesPoint.Argument)
                builder.AppendLine("Value: " & hitInfo.SeriesPoint.Value)
            End If

            ' Show hit-testing results 
            If builder.Length > 0 Then
                text1.Content = String.Format("Hit-testing results:" & Constants.vbLf + builder.ToString())
            Else
                text1.Content = "Move the mouse" & Constants.vbLf & " pointer over" & Constants.vbLf & " the chart to see" & Constants.vbLf & " information on" & Constants.vbLf & " hovered chart" & Constants.vbLf & " elements."
            End If
        End Sub
    End Class
End Namespace

if (hitInfo != null && hitInfo.SeriesPoint != null) {
    SeriesPoint point = hitInfo.SeriesPoint;

Dim hitInfo As ChartHitInfo = Me.chartControl1.CalcHitInfo(e.GetPosition(Me.chartControl1))
If hitInfo IsNot Nothing AndAlso hitInfo.SeriesPoint IsNot Nothing Then
    Dim point As SeriesPoint = hitInfo.SeriesPoint