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How to change line style to smoothed line in line chart using XlsIO?

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This article explains how to change line style to smoothed line in line chart using XlsIO.


What is smoothed line?


A smoothed line helps you explore the potential relationships between two variables without fitting a specific model. Smoothed lines are most useful when the curvature of the relationship does not change sharply.



            Line style changed to smoothed line using XlsIO

To create a line chart and change the line style to smoothed line in Excel using XlsIO, you need to do the following steps.     


Steps to create change line style to smoothed line


  1. Initialize chart


Create a chart object by calling the worksheet.Charts.Add method and specify the chart type to ExcelChartType.Line enumeration value.


//Create the chart
IChartShape chart = worksheet.Charts.Add();
//Set chart type to Line
chart.ChartType = ExcelChartType.Line;


  1. Assign data


Set a range of data from the worksheet to chart’s DataRange property. To plot the series values in column and categories in row, set chart’s IsSeriesInRows property to false.


//Set region of Chart data
chart.DataRange = worksheet["A1:D6"];
//Set chart series in column for assigned data region
chart.IsSeriesInRows = false;


  1. Apply basic chart elements


Add the basic elements like chart title, legend and datalabels.


  • ChartTitle of chart object.
  • Set DataLabels via DefaultDataPoint.
  • Set TRUE to chart’s HasLegend property, to show the legend.


//Set chart title
chart.ChartTitle = "Line Chart";              
//Set datalabels
IChartSerie serie1 = chart.Series[0];              serie1.DataPoints.DefaultDataPoint.DataLabels.IsValue = true;
serie1.SerieFormat.CommonSerieOptions.IsVaryColor = true;
//Set legend
chart.HasLegend = true;
chart.Legend.Position = ExcelLegendPosition.Bottom;


  1. Change line style to smoothed line


Change the line style of chart series to smoothed line.


  • Change line style by using IsSmoothedLine property.


//Change line style
(serie2.SerieFormat as ChartSerieDataFormatImpl).IsSmoothedLine = true;


Applicable properties for a Line Chart


Common property applicable for a line charts is


  1. IsVarycolor  (This property holds good for single series chart).



Applying other properties apart from the mentioned property might throw exception or the changes will not be reflected in the output document because those properties are not related to line chart.



Download Complete Sample


Download input file with data


To know more about creating charts with various settings using XlsIO, please refer the documentation.


The following C#/ VB.NET complete code snippet shows how to change line style to smoothed line in line chart using XlsIO.




using Syncfusion.XlsIO;
using System.Reflection;
using System.IO;
using Syncfusion.XlsIO.Implementation.Charts;
namespace Line_Style
    class Program
        static void Main(string[] args)
            using (ExcelEngine excelEngine = new ExcelEngine())
                IApplication application = excelEngine.Excel;
                application.DefaultVersion = ExcelVersion.Excel2016;
                //Open existing workbook with data entered
                Assembly assembly = typeof(Program).GetTypeInfo().Assembly;
                Stream fileStream = assembly.GetManifestResourceStream("Line_Style.InputTemplate.xlsx");
                IWorkbook workbook = application.Workbooks.Open(fileStream);
                IWorksheet worksheet = workbook.Worksheets[0];
                //Initialize chart
                IChartShape chart = worksheet.Charts.Add();
                chart.ChartType = ExcelChartType.Line;
                //Assign data
                chart.DataRange = worksheet["A1:D6"];
                chart.IsSeriesInRows = false;
                //Apply chart elements
                //Set chart title
                chart.ChartTitle = "Line Chart";
                //Set legend
                chart.HasLegend = true;
                chart.Legend.Position = ExcelLegendPosition.Bottom;
                //Set datalabels
                IChartSerie serie1 = chart.Series[0];
                IChartSerie serie2 = chart.Series[1];
                IChartSerie serie3 = chart.Series[2];
                serie1.DataPoints.DefaultDataPoint.DataLabels.IsValue = true;
                serie2.DataPoints.DefaultDataPoint.DataLabels.IsValue = true;
                serie3.DataPoints.DefaultDataPoint.DataLabels.IsValue = true;
                serie1.SerieFormat.CommonSerieOptions.IsVaryColor = true;
                serie2.SerieFormat.CommonSerieOptions.IsVaryColor = true;
                serie3.SerieFormat.CommonSerieOptions.IsVaryColor = true;
                //Change line style
                (serie2.SerieFormat as ChartSerieDataFormatImpl).IsSmoothedLine = true;
                //Positioning the chart in the worksheet
                chart.TopRow = 8;
                chart.LeftColumn = 1;
                chart.BottomRow = 23;
                chart.RightColumn = 8;
                //Saving the workbook
                Stream stream = File.Create("Output.xlsx");


Imports Syncfusion.XlsIO
Imports System.Reflection
Imports System.IO
Imports Syncfusion.XlsIO.Implementation.Charts
Namespace Line_Style
    Class Program
        Private Shared Sub Main(ByVal args() As String)
            Dim excelEngine As ExcelEngine = New ExcelEngine
            Dim application As IApplication = excelEngine.Excel
            application.DefaultVersion = ExcelVersion.Excel2016
            'Open existing workbook with data entered
            Dim assembly As Assembly = GetType(Program).GetTypeInfo.Assembly
            Dim fileStream As Stream = assembly.GetManifestResourceStream("Line_Style.InputTemplate.xlsx")
            Dim workbook As IWorkbook = application.Workbooks.Open(fileStream)
            Dim worksheet As IWorksheet = workbook.Worksheets(0)
            'Initialize chart
            Dim chart As IChartShape = worksheet.Charts.Add
            chart.ChartType = ExcelChartType.Line
            'Assign data
            chart.DataRange = worksheet("A1:D6")
            chart.IsSeriesInRows = False
            'Apply chart elements
            'Set chart title
            chart.ChartTitle = "Line Chart"
            'Set legend
            chart.HasLegend = True
            chart.Legend.Position = ExcelLegendPosition.Bottom
            'Set datalabels
            Dim serie1 As IChartSerie = chart.Series(0)
            Dim serie2 As IChartSerie = chart.Series(1)
            Dim serie3 As IChartSerie = chart.Series(2)
            serie1.DataPoints.DefaultDataPoint.DataLabels.IsValue = True
            serie2.DataPoints.DefaultDataPoint.DataLabels.IsValue = True
            serie3.DataPoints.DefaultDataPoint.DataLabels.IsValue = True
            serie1.SerieFormat.CommonSerieOptions.IsVaryColor = True
            serie2.SerieFormat.CommonSerieOptions.IsVaryColor = True
            serie3.SerieFormat.CommonSerieOptions.IsVaryColor = True
            'Change line style
            CType(serie2.SerieFormat, ChartSerieDataFormatImpl).IsSmoothedLine = True
            'Positioning the chart in the worksheet
            chart.TopRow = 8
            chart.LeftColumn = 1
            chart.BottomRow = 23
            chart.RightColumn = 8
            'Saving the workbook
            Dim stream As Stream = File.Create("Output.xlsx")
        End Sub
    End Class
End Namespace


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