How to change label formats and marks on an axis using a line graph

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            IAoInitialize ao = new AoInitializeClass();
            ao.Initialize(esriLicenseProductCode.esriLicenseProductCodeBasic);
            SampleLineV(@"path to your shapefile", "field name", @
                "path to your output image");
            ao.Shutdown();
        }

        static void SampleLineV(String pathToShapeFile, String seriesFieldName,
            String pathToOutImage)
        {

            // Open a workspace for the input shapefile.
            IWorkspaceFactory shapefileWorkspaceFactory = new
                ShapefileWorkspaceFactoryClass();
            IWorkspace shapefileWorkspace;
            shapefileWorkspace = shapefileWorkspaceFactory.OpenFromFile
                (System.IO.Path.GetDirectoryName(pathToShapeFile), 0);
            IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)
                shapefileWorkspace;

            // Get the table for the input shapefile.
            ITable table = (ITable)featureWorkspace.OpenFeatureClass
                (System.IO.Path.GetFileNameWithoutExtension(pathToShapeFile));

            // Create a data graph.
            IDataGraphT dataGraphT = new DataGraphTClass();

            // Add a line series.
            ISeriesProperties seriesProps = dataGraphT.AddSeries("line:vertical");
            seriesProps.SourceData = table;
            seriesProps.SetField(1, seriesFieldName);
            seriesProps.Marks = true;
            seriesProps.ValueFormat = "0.0E-0"; 
                // This will affect the marks' and legend's numerical output format.

            // Set line thickness.
            seriesProps.PenProperties.Width = 2;

            // Set line symbol properties.
            ILineSeriesProperties lineSeriesProps = (ILineSeriesProperties)
                seriesProps;
            lineSeriesProps.SymbolProperties.Style =
                esriDataGraphTSymbolType.esriDataGraphTSymbolCross;
            lineSeriesProps.SymbolProperties.BorderProperties.Color = 0x000000ff;

            // Set graph furniture properties.
            dataGraphT.LegendProperties.Visible = false;
            dataGraphT.get_AxisProperties(2).Title = System.IO.Path.GetFileName
                (pathToShapeFile);
            dataGraphT.get_AxisProperties(0).Title = seriesFieldName;
            dataGraphT.get_AxisProperties(0).Logarithmic = true;
            dataGraphT.get_AxisProperties(0).ValueFormat = "0.0e-0"; 
                // This will affect the axis label's numerical output format.

            // Update the data graph.
            dataGraphT.Update(null);

            // Export the graph to file (the format depends on the file extension).
            dataGraphT.ExportToFile(pathToOutImage);
        }
    }
}

Namespace ConsoleApplication1VBNET

Class Program
    Shared Sub Main(ByVal args() As String)
    Dim ao As IAoInitialize = New AoInitializeClass()
    ao.Initialize(esriLicenseProductCode.esriLicenseProductCodeBasic)
    SampleLineV("path to your shapefile", "field name", "path to your output image")
    ao.Shutdown()
End Sub

Shared Sub SampleLineV(ByVal pathToShapeFile As String, ByVal seriesFieldName As String, ByVal pathToOutImage As String)

' Open a workspace for the input shapefile.
Dim shapefileWorkspaceFactory As IWorkspaceFactory = New ShapefileWorkspaceFactoryClass()
Dim shapefileWorkspace As IWorkspace
shapefileWorkspace = shapefileWorkspaceFactory.OpenFromFile(System.IO.Path.GetDirectoryName(pathToShapeFile), 0)
Dim featureWorkspace As IFeatureWorkspace = CType(shapefileWorkspace, IFeatureWorkspace)

' Get the table for the input shapefile.
Dim table As ITable = CType(featureWorkspace.OpenFeatureClass(System.IO.Path.GetFileNameWithoutExtension(pathToShapeFile)), ITable)

' Create a data graph.
Dim dataGraphT As IDataGraphT = New DataGraphTClass()

' Add a line series.
Dim seriesProps As ISeriesProperties = dataGraphT.AddSeries("line:vertical")
seriesProps.SourceData = table
seriesProps.SetField(1, seriesFieldName)
seriesProps.Marks = True
seriesProps.ValueFormat = "0.0E-0" ' This will affect the marks' and legend's numerical output format.

' Set line thickness.
seriesProps.PenProperties.Width = 2

' Set line symbol properties.
Dim lineSeriesProps As ILineSeriesProperties = CType(seriesProps, ILineSeriesProperties)
lineSeriesProps.SymbolProperties.Style = esriDataGraphTSymbolType.esriDataGraphTSymbolCross
lineSeriesProps.SymbolProperties.BorderProperties.Color = 110000

' Set graph furniture properties.
dataGraphT.LegendProperties.Visible = False
dataGraphT.AxisProperties(2).Title = System.IO.Path.GetFileName(pathToShapeFile)
dataGraphT.AxisProperties(0).Title = seriesFieldName
dataGraphT.AxisProperties(0).Logarithmic = True
dataGraphT.AxisProperties(0).ValueFormat = "0.0e-0" ' This will affect the axis label's numerical output format.

' Update the data graph.
dataGraphT.Update(Nothing)

' Export the graph to file (the format depends on the file extension).
dataGraphT.ExportToFile(pathToOutImage)
End Sub

End Class

End Namespace