public AxisBase Axis { get; }

Public ReadOnly Property Axis As AxisBase

private void Form1_Load(object sender, EventArgs e) {
    chartControl1.AxisScaleChanged += OnChartAxisScaleChanged;
}

private void OnChartAxisScaleChanged(object sender, AxisScaleChangedEventArgs e) {
    AxisX axisX = e.Axis as AxisX;
    if (axisX == null) return;
    // In this event, you can access the properties of the corresponding axis, and
    // obtain the automatically calculated value for the axis date-time grid alignment and measure unit.
    axisX.Title.Visibility = DefaultBoolean.True;
    axisX.Title.Text = String.Format(
        "The Axis Grid Alignment Unit is {0} \r\nThe Axis Measure Unit is {1}", 
        e.Axis.DateTimeScaleOptions.GridAlignment.ToString(),
        e.Axis.DateTimeScaleOptions.MeasureUnit.ToString()
    );
}

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    AddHandler chartControl1.AxisScaleChanged, AddressOf OnChartAxisScaleChanged
End Sub

Private Sub OnChartAxisScaleChanged(ByVal sender As Object, ByVal e As AxisScaleChangedEventArgs)
    Dim axisX As AxisX = TryCast(e.Axis, AxisX)
    If axisX Is Nothing Then
        Return
    End If
    ' In this event, you can access the properties of the corresponding axis, and
    ' obtain the automatically calculated value for the axis date-time grid alignment and measure unit.
    axisX.Title.Visibility = DefaultBoolean.True
    axisX.Title.Text = String.Format("The Axis Grid Alignment Unit is {0} " & ControlChars.CrLf & "The Axis Measure Unit is {1}", e.Axis.DateTimeScaleOptions.GridAlignment.ToString(), e.Axis.DateTimeScaleOptions.MeasureUnit.ToString())
End Sub