Skip to main content
All docs

ChartControl.ConstantLineMoved Event

Occurs when a user moves a constant line.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v22.2.UI.dll

NuGet Package: DevExpress.Win.Charts


public event ConstantLineMovedEventHandler ConstantLineMoved

Event Data

The ConstantLineMoved event's data class is ConstantLineMovedEventArgs. The following properties provide information specific to this event:

Property Description
ConstantLine Returns a constant line that is being moved.
OldValue Returns the previous axis value.


Users can move constant lines if their RuntimeMoving option is enabled.


The following example adds a horizontal constant line with an editable title. Once a user moves a constant line, the title is updated to display the current constant line value.


private void OnFormLoad(object sender, EventArgs e) {

    ConstantLine constantLine = new ConstantLine();
    constantLine.AxisValue = 65.0;
    constantLine.Title.Text = "Title";    
    constantLine.RuntimeTitleEditing = true;
    constantLine.RuntimeMoving = true;

    XYDiagram diagram = chartControl1.Diagram as XYDiagram;

    chartControl1.ConstantLineMoved += OnChartControlConstantLineMoved;

private void OnChartControlConstantLineMoved(object sender, ConstantLineMovedEventArgs e) {
    e.ConstantLine.Title.Text = String.Format("{0:f3}",e.ConstantLine.AxisValue);
See Also