I quickly tried David's code above and it did not put the points where I expected..  I did not get a chance to talk it over with him though.  Did it work for you, Yann?

In my own sample (still a work in progress), I am also not getting the points in the right places; the mapping of the coordinates is still off.  I am correctly able to identify the "detached" points that need to be drawn.  I will be passing this onto someone else since I will be away for the next couple of weeks.

Hopefully David's solution is working and I did something wrong in my test (a distinct possibility), or we will get a new sample or snippet out to you soon.

ok, when i actually tried this, the closest i got was symbols displaying over all points, including null ones.  so i'm not sure that approach would have worked.

here's a FillSceneGraph event handler that should add symbols over isolated "single point lines" in your composite chart:

    Private Sub chtMainGraph_FillSceneGraph(ByVal sender As System.Object, ByVal e As Infragistics.UltraChart.Shared.Events.FillSceneGraphEventArgs) Handles chtMainGraph.FillSceneGraph       
        For Each layerApp As ChartLayerAppearance In Me.chtMainGraph.CompositeChart.ChartLayers
            If layerApp.ChartType = ChartType.LineChart OrElse layerApp.ChartType = ChartType.SplineChart Then
                Dim xAxis As IAdvanceAxis = CType(layerApp.ChartLayer.Grid("X"), IAdvanceAxis)
                Dim yAxis As IAdvanceAxis = CType(layerApp.ChartLayer.Grid("Y"), IAdvanceAxis)
                For Each currentSeries As NumericSeries In layerApp.Series
                    If currentSeries.Points.Count = 0 Then Resume Next
                    Dim soloPointFirst As Boolean = currentSeries.Points.Count = 1 OrElse (Not currentSeries.Points(0).Empty AndAlso currentSeries.Points(1).Empty)
                    If soloPointFirst Then
                        Dim location As New Point(xAxis.Map(0), yAxis.Map(currentSeries.Points(0).Value))
                        Me.AddSymbol(e.SceneGraph, location)
                    End If
                    For current As Integer = 1 To currentSeries.Points.Count - 2
                        Dim soloPoint As Boolean = Not currentSeries.Points(current).Empty AndAlso currentSeries.Points(current - 1).Empty AndAlso currentSeries.Points(current + 1).Empty
                        If soloPoint Then
                            Dim location As New Point(xAxis.Map(current), yAxis.Map(currentSeries.Points(current).Value))
                            Me.AddSymbol(e.SceneGraph, location)
                        End If
                    Next
                    Dim soloPointLast As Boolean = currentSeries.Points.Count > 1 AndAlso Not currentSeries.Points(currentSeries.Points.Count - 1).Empty AndAlso currentSeries.Points(currentSeries.Points.Count - 2).Empty
                    If soloPointLast Then
                        Dim location As New Point(xAxis.Map(currentSeries.Points.Count - 1), yAxis.Map(currentSeries.Points(currentSeries.Points.Count - 1).Value))
                        Me.AddSymbol(e.SceneGraph, location)
                    End If
                Next
            End If
        Next
    End Sub
    Private Sub AddSymbol(ByVal scene As SceneGraph, ByVal location As Point)
        Dim mySymbol As New Symbol(location, SymbolIcon.Circle, SymbolIconSize.Small)
        mySymbol.PE.ElementType = PaintElementType.SolidFill
        mySymbol.PE.Fill = Color.Red
        mySymbol.PE.Stroke = Color.Red
        scene.Add(mySymbol)
    End Sub

Tanks for the hint but i dont understand what you are trying to tell me

In fact I dont know how to use LineChart.LineAppearances

Remember that I use UltraWinChart.UltraChart grphic type component

How can I use your  LineChart.LineAppearances with this type of component

See what I use to configure this Chart what should I change or add

Thanks in advance!

-----------------------------------------------------------------

'first, we have to clear the chart layers

-----------------------------------------------------------------

chtMainGraph.CompositeChart.ChartAreas.Clear()

chtMainGraph.CompositeChart.ChartLayers.Clear()

= 0

= 0

Double

DataTable()

dttmp2 =

DataTable()

dttmp1 = oCurrentGraph.GetData()

dttmp2 = oCurrentGraph.GetSecondaryData()

'calculation of the highest value for the two Y axes

dttmp1.Rows

Then

Then

If

If

Next

dttmp2.Rows

Then

Then

If

If

Next

'we put add 5% of the maximum value for each Y axes

Then

Else

If

'Creation of the compositelegend object and of the chart area object

UltraChart.Resources.Appearance.CompositeLegend()

Infragistics.UltraChart.Resources.Appearance.ChartArea

'sets the bounds measure type of the chart in the window

'we add the chart area to the ultra chart object

'we create the axis and set their properties

Infragistics.UltraChart.Resources.Appearance.AxisItem(chtMainGraph, UltraChart.Shared.Styles.AxisNumber.X_Axis)

xaxis.OrientationType = UltraChart.Shared.Styles.AxisNumber.X_Axis

xaxis.DataType = UltraChart.Shared.Styles.AxisDataType.String

xaxis.Labels.ItemFormat = UltraChart.Shared.Styles.AxisItemLabelFormat.ItemLabel

xaxis.SetLabelAxisType = UltraChart.Core.Layers.SetLabelAxisType.ContinuousData

xaxis.Labels.Orientation = UltraChart.Shared.Styles.TextOrientation.Horizontal

xaxis.RangeType = UltraChart.Shared.Styles.AxisRangeType.Automatic

True

Infragistics.UltraChart.Resources.Appearance.AxisItem(chtMainGraph, UltraChart.Shared.Styles.AxisNumber.X2_Axis)

xaxis3.OrientationType = UltraChart.Shared.Styles.AxisNumber.X2_Axis

xaxis3.Extent = 30

xaxis3.LineThickness = 0

Infragistics.UltraChart.Resources.Appearance.AxisItem(chtMainGraph, UltraChart.Shared.Styles.AxisNumber.Y_Axis)

yaxis.OrientationType = UltraChart.Shared.Styles.AxisNumber.Y_Axis

yaxis.DataType = UltraChart.Shared.Styles.AxisDataType.Numeric

yaxis.Labels.ItemFormat = UltraChart.Shared.Styles.AxisItemLabelFormat.DataValue

yaxis.SetLabelAxisType = UltraChart.Core.Layers.SetLabelAxisType.ContinuousData

yaxis.Labels.Layout.Behavior = UltraChart.Shared.Styles.AxisLabelLayoutBehaviors.Auto

yaxis.Labels.Orientation = UltraChart.Shared.Styles.TextOrientation.Horizontal

yaxis.RangeType = UltraChart.Shared.Styles.AxisRangeType.Custom

yaxis.RangeMin = 0

'yaxis.RangeMax = highestYval

Then

Else

If

Infragistics.UltraChart.Resources.Appearance.AxisItem(chtMainGraph, UltraChart.Shared.Styles.AxisNumber.Y2_Axis)

yaxis2.OrientationType = UltraChart.Shared.Styles.AxisNumber.Y2_Axis

yaxis2.Extent = 200

yaxis2.LineThickness = 0

chtMainGraph.TitleRight.Extent = 200 - 40

'we use the composite chart that allow to use multiple style of chart in one

UltraChart.Resources.Appearance.NumericSeries

seriesLine.Label = dttmp1.Columns(1).ColumnName

UltraChart.Resources.Appearance.NumericSeries

seriesLine2.Label = dttmp2.Columns(1).ColumnName

UltraChart.Resources.Appearance.ChartLayerAppearance()

UltraChart.Resources.Appearance.ChartLayerAppearance()

UltraChart.Resources.Appearance.SplineChartAppearance

UltraChart.Resources.Appearance.LineAppearance

line.Thickness = 3

line.LineStyle.DrawStyle = UltraChart.Shared.Styles.LineDrawStyle.Solid

line.IconAppearance.Icon = UltraChart.Shared.Styles.SymbolIcon.Circle

line.SplineTension = 0.5

SPlinechartappearance.LineAppearances.Add(line)

SPlinechartappearance.NullHandling = UltraChart.Shared.Styles.NullHandling.DontPlot

UltraChart.Resources.Appearance.LineChartAppearance()

UltraChart.Resources.Appearance.LineAppearance()

line2.Thickness = 3

line2.IconAppearance.Icon = UltraChart.Shared.Styles.SymbolIcon.None

line2.LineStyle.DrawStyle = UltraChart.Shared.Styles.LineDrawStyle.Solid

linechartappearance2.LineAppearances.Add(line2)

linechartappearance2.NullHandling = UltraChart.Shared.Styles.NullHandling.DontPlot

seriesLine.Data.DataSource = dttmp1

seriesLine.Data.LabelColumn = dttmp1.Columns(0).ColumnName

seriesLine.Data.ValueColumn = dttmp1.Columns(1).ColumnName

UltraChart.Resources.Appearance.PaintElement(Color.Blue))

seriesLine2.Data.DataSource = dttmp2

seriesLine2.Data.LabelColumn = dttmp2.Columns(0).ColumnName

seriesLine2.Data.ValueColumn = dttmp2.Columns(1).ColumnName

UltraChart.Resources.Appearance.PaintElement(Color.Red))

appearanceLine.ChartType = UltraChart.Shared.Styles.ChartType.SplineChart

appearanceLine.ChartTypeAppearance = SPlinechartappearance

appearanceLine.ChartArea = area1

appearanceLine.Series.Add(seriesLine)

appearanceLine.AxisX = xaxis

appearanceLine.AxisY = yaxis

appearanceLine.LegendItem = UltraChart.Shared.Styles.LegendItemType.Series

appearanceLine2.ChartType = UltraChart.Shared.Styles.ChartType.LineChart

appearanceLine2.ChartTypeAppearance = linechartappearance2

appearanceLine2.ChartArea = area1

appearanceLine2.Series.Add(seriesLine2)

appearanceLine2.AxisX = xaxis

appearanceLine2.AxisY = yaxis

appearanceLine2.LegendItem = UltraChart.Shared.Styles.LegendItemType.Series

'we add the appearence layers to the chart

'we add the appearence layers to the legend

'' we set the properties to the legend

Rectangle(chtMainGraph.Size.Width - 130, 100, 100, 5 + (2 * 15) + 5)

compositeLegend.ChartComponent = chtMainGraph.CompositeChart.ChartComponent

compositeLegend.PE.ElementType = UltraChart.Shared.Styles.PaintElementType.Gradient

, 10)

compositeLegend.PE.FillGradientStyle = UltraChart.Shared.Styles.GradientStyle.ForwardDiagonal

compositeLegend.PE.Fill = Color.CornflowerBlue

compositeLegend.PE.FillStopColor = Color.Transparent

compositeLegend.Border.CornerRadius = 10

compositeLegend.Border.Thickness = 0

'we clear the legend on the composite chart before adding the new one

'we add each created axes to the area

'we add the range for the series and refresh the layer

Infragistics.UltraChart.Data.Series.ISeries() {seriesLine, seriesLine2})

try using the LineChart.LineAppearances collection to overlay symbols on the line.  that will give you some representation of the null points.

For a test we put 0 instead of NULL and the point and the line was show in the Chart

The problem for me is that 0 mean there are no error find in the vérification that i have made.

But Null mean that there are not be any verification done at this time

So one solution is to take out all the row that have a Null value and the week for that Null value with not be display anymore in the graph. Well my client want to see those weeks with the Null Value :(

That is why I am here, to see if we can find another solution

So I wish you a nice day and if you think at something let me know

a++