Asp.net C# ทำ Chart หลาย ๆ แท่ง แล้วสีของแท่งมันเป็นสีเดียวกัน อยากให้แท่งกราฟเป็นแท่งละสี

var ods = (from x in db.HistoryNCs select x.IP_Add).Distinct();
        foreach (var item in ods)
        {
            var ods1 = (from x in db.HistoryNCs where x.IP_Add == item select x.IP_Add).Count();
            dr = dt.NewRow();
            //dr["Month"] = month.ToString();
            dr["IP Address"] = item.ToString();
            dr["IPCount"] = ods1.ToString();
            dt.Rows.Add(dr);
        }
        int ser = Convert.ToInt32(ods.Count());
        for (int i = 0; i < ser; i++)
        {
            serieName = dt.Rows[i]["IP Address"].ToString();
            Chart1.Series.Add(serieName);
            //Chart1.ChartAreas.Add("ChartArea" + i.ToString());
            //Chart1.Series[i].ChartArea = "ChartArea" + i.ToString();
        }
        Chart1.Series[serieName].ChartType = SeriesChartType.Column;
        Chart1.Series[serieName].LegendText = serieName;
        Chart1.Series[serieName]["DrawingStyle"] = "Emboss";
        Chart1.Series[serieName].IsValueShownAsLabel = true;
        Chart1.DataSource = dt;
        Chart1.Series[serieName].XValueMember = "IP Address";
        Chart1.Series[serieName].YValueMembers = "IPCount";
        Chart1.DataBind();
        Chart1.ChartAreas["ChartArea"].AxisX.LabelStyle.Angle = -90;
        Chart1.ChartAreas["ChartArea"].AxisX.LabelStyle.Interval = 1;
        Chart1.ChartAreas["ChartArea"].AxisX.Title = "IP Address";
        Chart1.ChartAreas["ChartArea"].AxisY.Title = "จำนวนครั้ง";