Solved

ASP.NET postback problem

Posted on 2004-03-25
1
431 Views
Last Modified: 2012-06-21
Hi,

I am using the Carlos Web Chart Control on my aspx page, but everytime a postback occurs the Chart(rendered as an image) disappears.

//using this code the Chart disappears in postback
void Page_Load()
{
    if(!Page.IsPostBack)
    {
      CreateChart();
    }
}

//so I'm using this code which works but is unefficient...
void Page_Load()
{
      CreateChart();
}

//maybe this piece of code may also be helpfull in your solution
void CreateChart()
{
    LineChart chart = new  LineChart();
    chart.DataSource = GetDataSet().Tables[0].DefaultView;
    chart.DataXValueField = "Time";
    chart.DataYValueField = "Wavelenght";
    chart.LineMarker.Size = 0;
    chart.Line.Color=System.Drawing.Color.Blue;
    chart.Line.Width=2;
    chart.DataLabels.ForeColor = System.Drawing.Color.Blue;
    chart.DataBind();
    ChartControl1.Charts.Add(chart);
    ChartControl1.RedrawChart();
}



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Question by:Raab314159
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1 Comment
 
LVL 29

Accepted Solution

by:
David H.H.Lee earned 250 total points
ID: 10676239
Raab314159,
If the created component is created dynamically, you need to re-create the chart for every postback unless you only deal with viewstate problems only. If the used component is static, you only need to make sure EnableViewState=True.
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