public DateTimeGridAlignment GridAlignment { get; set; }

Public Property GridAlignment As DateTimeGridAlignment

using System;
using System.Windows.Forms;
using DevExpress.XtraCharts;
// ...

namespace FormatAxisLabels {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e) {
            // Create an empty chart.
            ChartControl chartControl1 = new ChartControl();

            // Create a bar series and add points to it.
            Series series1 = new Series("Series 1", ViewType.Bar);
            series1.Points.Add(new SeriesPoint(new DateTime(2009, 1, 1), new double[] { 26.25 }));
            series1.Points.Add(new SeriesPoint(new DateTime(2009, 2, 1), new double[] { 16.52 }));
            series1.Points.Add(new SeriesPoint(new DateTime(2009, 3, 1), new double[] { 22.21 }));
            series1.Points.Add(new SeriesPoint(new DateTime(2009, 4, 1), new double[] { 15.35 }));
            series1.Points.Add(new SeriesPoint(new DateTime(2009, 5, 1), new double[] { 24.15 }));

            // Add the series to the chart.
            chartControl1.Series.Add(series1);

            // Hide the legend (if necessary).
            chartControl1.Legend.Visibility = DevExpress.Utils.DefaultBoolean.False;

            // Set the scale type for the series' arguments and values.
            series1.ArgumentScaleType = ScaleType.DateTime;
            series1.ValueScaleType = ScaleType.Numerical;

            // Cast the chart's diagram to the XYDiagram type, to access its axes.
            XYDiagram diagram = chartControl1.Diagram as XYDiagram;

            // Define the date-time measurement unit, to which the beginning of 
            // a diagram's gridlines and labels should be aligned. 
            diagram.AxisX.DateTimeScaleOptions.GridAlignment = DateTimeGridAlignment.Day;

            // Define the detail level for date-time values.
            diagram.AxisX.DateTimeScaleOptions.MeasureUnit = DateTimeMeasureUnit.Month;

            // Define the custom date-time format (name of a month) for the axis labels.
            diagram.AxisX.Label.TextPattern = "{V:MMMM}";

            // Since the ValueScaleType of the chart's series is Numerical,
            // it is possible to customize the NumericOptions of Y-axis.
            diagram.AxisY.Label.TextPattern = "{V:C1}";

            // Add a title to the chart (if necessary).
            ChartTitle chartTitle1 = new ChartTitle();
            chartTitle1.Text = "Axis Scale Types";
            chartControl1.Titles.Add(chartTitle1);

            // Add the chart to the form.
            chartControl1.Dock = DockStyle.Fill;
            this.Controls.Add(chartControl1);
        }

    }
}

Imports System
Imports System.Windows.Forms
Imports DevExpress.XtraCharts
' ...

Namespace FormatAxisLabels
    Partial Public Class Form1
        Inherits Form

        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
            ' Create an empty chart.
            Dim chartControl1 As New ChartControl()

            ' Create a bar series and add points to it.
            Dim series1 As New Series("Series 1", ViewType.Bar)
            series1.Points.Add(New SeriesPoint(New Date(2009, 1, 1), New Double() { 26.25 }))
            series1.Points.Add(New SeriesPoint(New Date(2009, 2, 1), New Double() { 16.52 }))
            series1.Points.Add(New SeriesPoint(New Date(2009, 3, 1), New Double() { 22.21 }))
            series1.Points.Add(New SeriesPoint(New Date(2009, 4, 1), New Double() { 15.35 }))
            series1.Points.Add(New SeriesPoint(New Date(2009, 5, 1), New Double() { 24.15 }))

            ' Add the series to the chart.
            chartControl1.Series.Add(series1)

            ' Hide the legend (if necessary).
            chartControl1.Legend.Visibility = DevExpress.Utils.DefaultBoolean.False

            ' Set the scale type for the series' arguments and values.
            series1.ArgumentScaleType = ScaleType.DateTime
            series1.ValueScaleType = ScaleType.Numerical

            ' Cast the chart's diagram to the XYDiagram type, to access its axes.
            Dim diagram As XYDiagram = TryCast(chartControl1.Diagram, XYDiagram)

            ' Define the date-time measurement unit, to which the beginning of 
            ' a diagram's gridlines and labels should be aligned. 
            diagram.AxisX.DateTimeScaleOptions.GridAlignment = DateTimeGridAlignment.Day

            ' Define the detail level for date-time values.
            diagram.AxisX.DateTimeScaleOptions.MeasureUnit = DateTimeMeasureUnit.Month

            ' Define the custom date-time format (name of a month) for the axis labels.
            diagram.AxisX.Label.TextPattern = "{V:MMMM}"

            ' Since the ValueScaleType of the chart's series is Numerical,
            ' it is possible to customize the NumericOptions of Y-axis.
            diagram.AxisY.Label.TextPattern = "{V:C1}"

            ' Add a title to the chart (if necessary).
            Dim chartTitle1 As New ChartTitle()
            chartTitle1.Text = "Axis Scale Types"
            chartControl1.Titles.Add(chartTitle1)

            ' Add the chart to the form.
            chartControl1.Dock = DockStyle.Fill
            Me.Controls.Add(chartControl1)
        End Sub

    End Class
End Namespace

AxisX.DateTimeScaleOptions.AutoGrid = false;
    AxisX.DateTimeScaleOptions.GridAlignment = gridAlignment;
}

AxisX.DateTimeScaleOptions.AutoGrid = False
    AxisX.DateTimeScaleOptions.GridAlignment = gridAlignment
End Sub