記錄C#窗體曲線圖

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;

namespace CCIMS
{
    public partial class Form_SeatingArrangement : Form
    {
        Properties.Settings config = new Properties.Settings();
        _DataBase._DataCtrl dc;
        DataSet ds = new DataSet();
        bool moveFalg;//移動控件標誌

        bool formClose = false;

        Point mouseOff;//鼠標移動位置變量
        int x = 0;
        int y = 0;

        private static Form_SeatingArrangement form_SeatingArrangement = new Form_SeatingArrangement();

        public static Form_SeatingArrangement GetIsOpen()
        {
            if (form_SeatingArrangement.IsDisposed)
            {
                form_SeatingArrang