using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Text.RegularExpressions;
using System.IO;
using System.Windows.Forms.DataVisualization.Charting;

namespace Test_1
{
    public partial class Form1 : Form
    {
        private Random _R = new Random();
        Random rand = new Random();

        int cind = 0;
        char[] arr = new char[] { 'a', 'b', 'c'};

        public Form1()
        {
            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)
        {
            var leg = CreateLegend();
            chart1.Legends.Add(leg);
            chart1.Series.Add(CreateSeries(leg));
        }

        public Series CreateSeries(Legend legend)
        {
            var seriesDetail = new Series();
            seriesDetail.Name = "Result Chart" + arr[cind++];
            seriesDetail.IsValueShownAsLabel = false;
            seriesDetail.ChartType = SeriesChartType.Pie;
            seriesDetail.BorderWidth = 2;

            for (int i = 0; i < 10; i++)
            {
                var p = seriesDetail.Points.Add(rand.NextDouble());
                p.LegendText = new string('x', i);

            }

            seriesDetail.ChartArea = "Result Chart";
            seriesDetail.Legend = legend.Name;
            return seriesDetail;
        }

        public Legend CreateLegend()
        {
            var legend = new Legend();

            legend.Enabled = true;
            legend.Font = new Font("Arial", 11F);
            legend.ForeColor = Color.FromArgb(102, 102, 102);
            legend.InsideChartArea = "Result Chart";

            legend.Position = new ElementPosition(65, 10, 30, 60);
            legend.Name = string.Format("Legend No. {0}", cind);

            legend.LegendStyle = LegendStyle.Column;

            legend.CellColumns.Add(new LegendCellColumn() { ColumnType = LegendCellColumnType.SeriesSymbol });
            legend.CellColumns.Add(new LegendCellColumn()
            {
                ColumnType = LegendCellColumnType.Text,
                Alignment = ContentAlignment.MiddleLeft
            });

            return legend;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            chart1.Series.Clear();
            chart1.Legends.Clear();
        }
    }
}