How to refresh the piechart in C#

Question

5.00/5 (1 vote)

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I have made a method including the code of pie chart and call that method everywhere i need to refresh the chart, but whenever i click on those buttons where i have called the method then the pie chart duplicates the value automatically. And also i have tried Refresh() and Update option too but it doesn't work.

What I have tried:

public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
chart();
}
private void chart()
{
chart1.Series["new"].Points.AddXY("Peter", "1000");
chart1.Series["new"].Points.AddXY("Julia", "1000");
}

private void button1_Click(object sender, EventArgs e)
{
chart();
}
}

Posted 26-Jun-16 19:04pm

Member 12605081

Updated 26-Jun-16 20:30pm

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Comments

BillWoodruff 27-Jun-16 1:13am

There's no mystery in your code: you call chart() and the points are added again.

To assist you further we really need to know what "chart" is, it it something you are drawing using the 'Paint Event of some Control; is it a 3rd. party component ?

And, what's happening that you need to refresh it ? Be specific.

Member 12605081 27-Jun-16 1:20am

yes, i m using 3rd party component and i need to refresh it , i need a solution so can u please help me out

BillWoodruff 27-Jun-16 3:08am

Understood, but what is the reason you need to refresh the visual appearance of the Chart when the data points have not changed ? What do your eyes SEE that is "wrong" ?

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JayantaChatterjee · Answer 1 · 2016-06-26T20:30:00

Hi,
change the method code:-

C#

private void chart()
{
chart1.Series["new"].Points.AddXY("Peter", "1000");
chart1.Series["new"].Points.AddXY("Julia", "1000");
}

with this:-

C#

private void chart()
{
chart1.Series.["new"].Points.Clear();
chart1.Series["new"].Points.AddXY("Peter", "1000");
chart1.Series["new"].Points.AddXY("Julia", "1000");
}

As @BillWoodruff says that every time you call the chart() method it added the extra points to your chart, so you need to clear the all the previous points and then add new points to the chart..