c# - Problem adding datapoint dynamically to chart. No value shows up -

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i'm trying learn charting control in asp.net, having problems.

all want make simple column chart. every column should have name. want manipulate data database in codebehind , add column chart, name on column.

the examples i'm reviewing adds them in .ascx file. doing same thing in codebehind should straight forward, somehow not work. example i'm looking @ this:

<asp:chart id="chtnbachampionships" runat="server"> <series>     <asp:series name="championships" yvaluetype="int32" palette="berry"     charttype="column"         chartarea="mainchartarea" isvalueshownaslabel="true">         <points>                             <asp:datapoint axislabel="celtics" yvalues="0" />             <asp:datapoint axislabel="lakers" yvalues=" />             <asp:datapoint axislabel="bulls" yvalues="6" />             <asp:datapoint axislabel="spurs" yvalues="4" />             <asp:datapoint axislabel="76ers" yvalues="3" />             <asp:datapoint axislabel="pistons" yvalues="3" />             <asp:datapoint axislabel="warriors" yvalues="3" />             <asp:datapoint axislabel="mara" yvalues="4" />             <asp:datapoint axislabel="saza" yvalues="9" />             <asp:datapoint axislabel="buha" yvalues="6" />         </points>     </asp:series> </series> <chartareas>     <asp:chartarea name="mainchartarea">     </asp:chartarea> </chartareas>

i try add datapoint in codebehind this:

    datapoint dp = new datapoint();     dp.axislabel = "test";     dp.yvalues = new double[18];      this.chtnbachampionships.series["championship"].points.add(dp);

but gives me 0 in graph. there obvious i'm missing?

this code snippet using:

        dp = new datapoint(i++, value);         dp.axislabel = axisname;         dp.tooltip = axisname;         dp.setvaluey(value);         dp.isvalueshownaslabel = true;         s1.points.add(dp);         dp.xvalue = s1.points.count;

where s1 series object. maybe need specify value x asis, too...


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