ASP.NET Stackedbar Column Markers

I'm trying to add markers to my glass bar graph programmatically and they don't seem to show up. Actually, I need to show the average marker for the datatop, but right now, I can't even show a simple marker on the chart.

What am I doing wrong?

code:

Sizing chart as new chart chart.ID = DtDistinct.Rows (I) ("CourseSisID")

                Dim chartareas As New ChartArea
                chart.ChartAreas.Add(chartareas)

                chart.Series.Clear()

                chart.DataBindCrossTable(DtRecords.DefaultView, "Outcomescore", "ShortName", "RecordsPerGroup", "")

                chart.ChartAreas(0).AxisY.Interval = 1
                chart.ChartAreas(0).AxisY.Enabled = AxisEnabled.False


                chart.Palette = ChartColorPalette.None
                chart.PaletteCustomColors = New Color() {ColorTranslator.FromHtml("#DF5B59"), ColorTranslator.FromHtml("#E0D773 "), ColorTranslator.FromHtml("#8AAC53"), ColorTranslator.FromHtml("#6A843F")}
                chart.ChartAreas(0).AxisX.MajorGrid.Enabled = False
                chart.ChartAreas(0).AxisY.MajorGrid.Enabled = False




                For Each cs As Series In chart.Series
                    cs.ChartType = SeriesChartType.StackedBar

                    cs.Points().FindMaxByValue.MarkerColor = Color.AliceBlue
                    cs.Points().FindMaxByValue.MarkerSize = 13
                    cs.Points().FindMaxByValue.MarkerStyle = MarkerStyle.Diamond


                Next


                pnlcharts.Controls.Add(chart)

      

        
        
        
      

    

Here is an image of what I am trying to do. I know the above code won't give me the image below, but I was trying to find a workaround with the above code before I realized that markers cannot be displayed on histograms.

I would like to see a bar in a bar chart. The striped line should appear at the calculated average number of points.

Thus, another way I could do is to use annotations as markers are not supported by plots on the stack. I wrote the following code to add an annotation line, but I still don't need the output, which I only need because I don't know how to do it for each Y value in the chart.

Here is my code:

Sizing chart as new chart chart.ID = DtDistinct.Rows (I) ("CourseSisID")

Dim chartareas As new ChartArea chart.ChartAreas.Add (chartareas)

chart.DataBindCrossTable (DtRecords.DefaultView, "OutcomeScore", "ShortName", "RecordsPerGroup", "Label = RecordsPerGroup")

                chart.Palette = ChartColorPalette.None
                chart.PaletteCustomColors = New Color() {ColorTranslator.FromHtml("#DF5B59"), ColorTranslator.FromHtml("#E0D773 "), ColorTranslator.FromHtml("#8AAC53"), ColorTranslator.FromHtml("#6A843F")}

                chart.ChartAreas(0).AxisX.MajorGrid.Enabled = False
                chart.ChartAreas(0).AxisY.MajorGrid.Enabled = False



                Dim charttitle As New Title
                charttitle.Text = DtDistinct.Rows(I)("CourseSisID")
                chart.Titles.Add(charttitle)

                For Each cs As Series In chart.Series
                    cs.ChartType = SeriesChartType.StackedBar
                Next


                Dim ann1 As New VerticalLineAnnotation()
                ann1.AxisX = chart.ChartAreas(0).AxisX
                ann1.AxisY = chart.ChartAreas(0).AxisY
                ann1.IsSizeAlwaysRelative = False
               ann1.X = chart.DataManipulator.Statistics.Mean(chart.Series(0).Name)


                ann1.IsInfinitive = True
                ann1.ClipToChartArea = chart.ChartAreas(0).Name
                ann1.LineColor = Color.Coral
                ann1.LineWidth = 3


                ann1.AnchorX = 1
                ann1.AnchorY = 5

                chart.Annotations.Add(ann1)                

                ann1.LineDashStyle = ChartDashStyle.Dash

                pnlcharts.Controls.Add(chart)

      

        
        
        
      

    

This is what I get with the above code:

Here's what I need: Note that the band line has a different meaning for each bar.