Hello,

 I have a Line Chart and Series attached from a Datatable. When I have a NULL Value within a series and using

UltraChart1.LineChart.NullHandling = UltraChart.Shared.Styles.NullHandling.DontPlot

 then it happens that the Datapoint before the Null value is not rendered.

 Steps to reproduce:

Imports Infragistics

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Dim UltraChart1 As New Win.UltraWinChart.UltraChart
        UltraChart1.ChartType = UltraChart.Shared.Styles.ChartType.LineChart


        Dim LineAppearance01 As New UltraChart.Resources.Appearance.LineAppearance

        With LineAppearance01
            .LineStyle.DrawStyle = UltraChart.Shared.Styles.LineDrawStyle.Solid
            .IconAppearance.Icon = UltraChart.Shared.Styles.SymbolIcon.Circle
            .IconAppearance.IconSize = UltraChart.Shared.Styles.SymbolIconSize.Large
            .Thickness = 3
            .IconAppearance.PE.Fill = Color.MidnightBlue
        End With


        UltraChart1.LineChart.LineAppearances.Add(LineAppearance01)

        UltraChart1.LineChart.NullHandling = UltraChart.Shared.Styles.NullHandling.DontPlot

        Dim dt As New DataTable("Data")

        dt.Columns.Add("Col1", GetType(System.Double))
        dt.Columns.Add("Col2", GetType(System.Double))
        dt.Columns.Add("Col3", GetType(System.Double))
        dt.Columns.Add("Col4", GetType(System.Double))
        dt.Columns.Add("Col5", GetType(System.Double))

        Dim dr As DataRow = dt.NewRow

        dr(0) = 8.0
        dr(1) = DBNull.Value
        dr(2) = 15.5
        dr(3) = 12.0
        dr(4) = 11

        dt.Rows.Add(dr)
        UltraChart1.DataSource = dt
        UltraChart1.DataBind()
        Me.Controls.Add(UltraChart1)
    End Sub
End Class

You see on the chart that the first datapoint [dr(0) = 8.0] is not on the chart.

Change 

        dr(0) = 8.0
        dr(1) = DBNull.Value
        dr(2) = 15.5

To

        dr(0) = 8.0
        dr(1) = 15.5
        dr(2) = DBNull.Value

and try again. Then it works as expected

I really need your help as my User do not trust anymore in the Application.

 Thanks