Thank Yudi .

    Good luck to you

VanTu :)

Hi . Thanks Glenn Layaar  

i finish my ex

i using the 2 dropdownnlist show columns and chose data need show to chart

here is my EX:

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{

ChartPivotDataConfig t = new ChartPivotDataConfig();
t.DataMember = DropDownList1.SelectedValue; ;
t.AutoCalc = AutoCalc.Count;
WebGrid1.ChartDataCollection.Add(t);

}

protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
{

ChartPivotFilterConfig t1 = new ChartPivotFilterConfig();
t1.DataMember = DropDownList2.SelectedValue; ;
WebGrid1.ChartCategoryCollection.Add(t1);

}