using System;
using System.Windows.Forms;
using System.Drawing;
using System.Data.OleDb;
using System.Data;
using System.IO;
using System.Text;
using System.Collections.Generic;

class form1: Form {
    MonthCalendar cal1;
    DataGridView gd0;
    int row;
    int coloum;
    form1() {
        Text = "DataGrid";
        ClientSize = new Size(580, 400);
        gd0 = new DataGridView();
        gd0.Location = new Point(50, 20);
        gd0.Width = 500;
        gd0.Height = 300;
        Controls.AddRange(new Control[] {
            gd0
        });
        Button btn1 = new Button();
        btn1.Location = new Point(50, 330);
        btn1.Text = "load";
        btn1.Click += btn1_Click;
        Controls.AddRange(new Control[] {
            btn1
        });
        Button btn2 = new Button();
        btn2.Location = new Point(150, 330);
        btn2.Text = "save";
        btn2.Click += btn2_Click;
        Controls.AddRange(new Control[] {
            btn2
        });
        gd0.CellClick += new DataGridViewCellEventHandler(OnChanged);
    }
    private void OnChanged(object sender, DataGridViewCellEventArgs e) {
        int ri = e.RowIndex;
        int ci = e.ColumnIndex;
        if (ci == 0)
        {
            this.cal1 = new System.Windows.Forms.MonthCalendar();
            this.cal1.DateSelected += new System.Windows.Forms.DateRangeEventHandler(this.cal1_DateSelected);
            gd0.Controls.Add(cal1);
            cal1.Show();
            coloum = e.ColumnIndex;
            row = e.RowIndex;
        }
    }
    private void cal1_DateSelected(object sender, System.Windows.Forms.DateRangeEventArgs e) {
        gd0[coloum, row].Value = e.Start.ToShortDateString();
        (sender as MonthCalendar).Dispose();
    }
    void btn1_Click(object sender, System.EventArgs e) {
        Encoding enc = Encoding.GetEncoding("Shift_JIS");
        string file = "test1.csv";
        StreamReader reader = new StreamReader(file, enc);
        string temp = reader.ReadToEnd();
        string[] lines = temp.Split(new string[] {
            "\r\n"
        }, StringSplitOptions.None);
        string[] spLine;
        spLine = lines[0].Split(new char[] {
            ',',
            '\t'
        }, StringSplitOptions.None);
        gd0.ColumnCount = spLine.Length;
        for (int i = 0; i < spLine.Length; i++)
        {
            gd0.Columns[i].HeaderText = spLine[i].Trim('"');
        }
        DataGridViewRow[] rows = new DataGridViewRow[lines.Length - 1];
        for (int i = 1; i < lines.Length; i++)
        {
            spLine = lines[i].Split(new char[] {
                ',' ,
                '\t'
            }, StringSplitOptions.None);
            for (int j = 0; j < spLine.Length; j++)
            {
                spLine[j] = spLine[j].Trim('"');
            }
            DataGridViewRow row = new DataGridViewRow();
            row.CreateCells(gd0);
            row.SetValues(spLine);
            rows[i - 1] = row;
        }
        gd0.Rows.AddRange(rows);
        MessageBox.Show("ok");
    }
    void btn2_Click(object sender, System.EventArgs e) {
        StreamWriter sw = new StreamWriter("test2.csv", false);
        int rowCount = gd0.Rows.Count;
        if (gd0.AllowUserToAddRows == true)
        {
            rowCount = rowCount - 1;
        }
        for (int i = 0; i < rowCount; i++)
        {
            List<String> strList = new List<String>();
            for (int j = 0; j < gd0.Columns.Count; j++)
            {
                String s1 = (String) gd0[j, i].Value;
                String s2 = Convert.ToString(gd0[j, i].Value);
                strList.Add(s2);
            }
            String[] strArray = strList.ToArray();
            String strCsvData = String.Join(",", strArray);
            sw.WriteLine(strCsvData);
        }
        sw.Close();
        MessageBox.Show("ok");
    }
    [STAThread]
    public static void Main() {
        Application.Run(new form1());
    }
}