Imports C1.Win.C1Chart

・・・

Private test As System.Drawing.Image

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
　　Dim series As ChartDataSeries = C1WebChart1.ChartGroups.Group0.ChartData.SeriesList(0)
　　series.SymbolStyle.Shape = SymbolShapeEnum.None
　　test = System.Drawing.Image.FromFile(Server.MapPath("./img/72057.png"))
End Sub


Private Sub C1WebChart1_Paint(sender As Object, e As System.Windows.Forms.PaintEventArgs) Handles C1WebChart1.Paint
　　Dim target As Integer = 0
　　Dim max As Integer = C1WebChart1.ChartGroups.Group0.ChartData.SeriesList(target).PointData.Length
　　For i As Integer = 0 To max - 1
　　　　Dim rect As System.Drawing.Rectangle = C1WebChart1.ChartGroups.Group0.DataIndexToRect(target, i)
　　　　rect.Inflate(5, 5)
　　　　e.Graphics.DrawImage(test, rect)
　　Next
End Sub

using C1.Win.C1Chart;

・・・

private System.Drawing.Image test;

protected void Page_Load(object sender, EventArgs e)
{
　　ChartDataSeries series = C1WebChart1.ChartGroups.Group0.ChartData.SeriesList[0];
　　series.SymbolStyle.Shape = SymbolShapeEnum.None;
　　test = System.Drawing.Image.FromFile(Server.MapPath("./img/72057.png"));
}

protected void C1WebChart1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
　　int target = 0;
　　int max = C1WebChart1.ChartGroups.Group0.ChartData.SeriesList[target].PointData.Length;
　　for (int i = 0; i < max; i++)
　　{
　　　　System.Drawing.Rectangle rect = C1WebChart1.ChartGroups.Group0.DataIndexToRect(target, i);
　　　　rect.Inflate(5, 5);
　　　　e.Graphics.DrawImage(test, rect);
　　}
}