参考

Dim Chart As WinForm.Chart \'定义一个图表变量
Dim Series As WinForm.ChartSeries \'定义一个图系变量
Chart= e.Form.Controls("Chart1") \' 引用窗口中的图表
Chart.SeriesList.Clear() \'清除图表原来的图系
Series = Chart.SeriesList.Add() \'增加一个图系
Series.Length = 10 \'新增图系包括10个数据点
For i As Integer = 0 To 9 \'指定每个数据点的位置
    Series.X(i) = i \'指定水平坐标
    Series.Y(i) = i + Rand.Next(5) \'垂直坐标用随机数生成
Next
Dim c1Chart1 = Chart.basecontrol
Dim lbls = c1Chart1.ChartLabels
For i As Integer = 0 To 9
    Dim lbl As C1.Win.C1Chart.Label = lbls.LabelsCollection.AddNewLabel()
    lbl.Text = Format(series.y(i), "0.00%")
   
    lbl.AttachMethod = C1.Win.C1Chart.AttachMethodEnum.DataIndex
    lbl.AttachMethodData.GroupIndex = 0
    lbl.AttachMethodData.SeriesIndex = 0
    lbl.AttachMethodData.PointIndex = i
    lbl.Style.ForeColor = Color.Red
    lbl.Compass = LabelCompassEnum.South
    lbl.Visible = True
Next