Chart Feature Empty Value guide for ASP.NET AJAX, C#, VB.NET, display null in chart series

Chart Feature Empty Value in ASP.NET

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Information to Chart Empty Value Feature

The KaxChart component from our ASP.NET AJAX SDK allows users to approximate missing values between known data points. And the feature to make this functionality feasible is called Empty Value.

The web chart empty value feature is applicable for most chart types, including the bar, line and area based charts. And another incredible strength of the chart empty value feature is that it entitles users the full ability to control the displaying style of the empty values. For instance, you can set its pen style, width and color properties individually. Therefore, the display form of the empty values can be totally different from the main values. Here you can view ourempty value free online demo.

How to Display Empty Value

To help users have a better control of this empty value chart feature, here we offer an aspx programming example. In the example below, the empty value will be displayed in html chart in the form of dash when setting the empty value property to true.


<kettic:KaxChart  runat="server" Width="370" ID="KaxChart1" Skin="Kettic">
                <SeriesSet>
                    <kettic:ChartSeries  Name="series 1"  View="Bar">                        
                        <Points>
                            <kettic:ChartSeriesPoint  Value="1" Argument="1">
                            </kettic:ChartSeriesPoint>
                            <kettic:ChartSeriesPoint  Value="2" Argument="2">
                            </kettic:ChartSeriesPoint>
                            <kettic:ChartSeriesPoint  Value="3" Argument="3"   IsEmpty="true"  Label-TextArea-Visible="true" Label-Visible="true">
                            </kettic:ChartSeriesPoint>
                            <kettic:ChartSeriesPoint  Value="4" Argument="4">
                            </kettic:ChartSeriesPoint>
                            <kettic:ChartSeriesPoint  Value="5" Argument="5">
                            </kettic:ChartSeriesPoint>
                        </Points>
                    </kettic:ChartSeries>
                </SeriesSet>            
            </kettic:KaxChart>

If you want to display the empty value in chart using C#.NET programming code, you can refer to following C# programming example.


KaxChart1.SeriesSet[0].Points[1].IsEmpty = true;
KaxChart1.SeriesSet[0].Points[1].Label.TextArea.Visible = true;
KaxChart1.SeriesSet[0].Points[1].Label.Visible = true;

Another thing that needs to be mentioned here is that you can also hide the empty value in chart by setting the values of Label.TextArea.Visible and Label.Visible to false.
set chart empty value feature in asp.net ajax

set chart empty value feature in asp.net ajax

Note: In order to meet the basic needs of running the KaxChart control, please make sure that your ASP.NET web application has installed NET Framework 3.5 or above versions and that you have installed all the necessary dlls from our ASP.NET AJAX SDK into your ASP.NET web application.

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Overview Getting Started

Chart Element

Diagram Series Axes Legend Caption Tick Data Grid

Chart Type

Bar Chart Point Chart Line Chart Pie Chart Area Chart Gantt Chart Bubble Chart Bezier Chart Spline Chart Spline Area Chart Candle Chart Chart With Stacked Full Stacked Chart

Features

Automatic Layout Automatic Text-wrapping Scrolling

Empty Values

Scale Break Multiline Labels Wise Labels Marking Areas Multiple Types Interactive Drill Down Shadow Edting

Data Binding

Array Data List Data Database Data XML Data

Chart Style

Chart Skin ASP.NET AJAX Grid UI Control