private void MenuItem4_Click(object sender, RoutedEventArgs e)
        {
            CalcuateSalary go = new CalcuateSalary();

            go.Show();
        }
        private void InsertSalary_Click(object sender, RoutedEventArgs e)
        {
            dataGrid.SelectedIndex = 0;

            con.Open();
            string          readersql1  = "select sMonth from salary WHERE sMonth='" + Convert.ToDateTime(datePick2.Text).ToString("yyyy-MM-dd") + "'";
            MySqlCommand    commandnaja = new MySqlCommand(readersql1, con);
            MySqlDataReader readdata    = commandnaja.ExecuteReader();

            while (readdata.Read())
            {
                datecheck = Convert.ToDateTime(readdata["sMonth"]).ToString("dd/MM/yyyy");

                var myDate  = DateTime.Parse(datecheck);
                var newDate = myDate.AddYears(-543);
                datecheck = newDate.ToShortDateString();
            }
            con.Close();

            if (datePick2.Text == datecheck)
            {
                MessageBoxResult result1 = MessageBox.Show("คุณมีข้อมูลนี้อยู่แล้วต้องการแก้ไขหรือไม่?", "รอคำยืนยัน", MessageBoxButton.YesNo, MessageBoxImage.Question);
                if (result1 != MessageBoxResult.Yes)
                {
                    return;
                }
                else
                {
                    for (int i = 0; i < dataGrid.Items.Count; i++)
                    {
                        object item = dataGrid.Items[i];
                        showid       = (dataGrid.SelectedCells[1].Column.GetCellContent(item) as TextBlock).Text;
                        showname     = (dataGrid.SelectedCells[2].Column.GetCellContent(item) as TextBlock).Text;
                        showlastname = (dataGrid.SelectedCells[3].Column.GetCellContent(item) as TextBlock).Text;

                        con.Open();
                        string          readersql2 = "select * from checkwork WHERE (checkDate BETWEEN '" + Convert.ToDateTime(datePick1.Text).ToString("yyyy-MM-dd") + "' AND '" + Convert.ToDateTime(datePick2.Text).ToString("yyyy-MM-dd") + "') AND (checkID='" + showid + "')";
                        MySqlCommand    commandna  = new MySqlCommand(readersql2, con);
                        MySqlDataReader readerdata = commandna.ExecuteReader();

                        while (readerdata.Read())
                        {
                            value   += Convert.ToInt32(readerdata["checkPay"]);
                            getvalue = value;
                        }
                        value = 0;
                        con.Close();

                        con.Open();
                        MySqlCommand cmd2 = new MySqlCommand();
                        cmd2.Connection  = con;
                        cmd2.CommandText = @"UPDATE salary SET sMonth='" + Convert.ToDateTime(datePick2.Text).ToString("yyyy-MM-dd") + "',empID='" + showid + "',sName='" + showname + "',sLastname='" + showlastname + "',sSalary='" + getvalue + "',sSave=now() WHERE (sMonth='" + Convert.ToDateTime(datePick2.Text).ToString("yyyy-MM-dd") + "') AND (empID='" + showid + "')";
                        cmd2.ExecuteNonQuery();
                        con.Close();
                    }
                    MessageBox.Show("แก้ไขเรียบร้อยแล้ว!!!", "เรียบร้อย");
                    CalcuateSalary go = new CalcuateSalary();
                    this.Close();
                    go.Show();
                }
            }
            else
            {
                MessageBoxResult result = MessageBox.Show("คุณต้องการบันทึกใช่ไหม?", "รอคำยืนยัน", MessageBoxButton.YesNo, MessageBoxImage.Question);

                if (result != MessageBoxResult.Yes)
                {
                    return;
                }
                else
                {
                    using (MySqlCommand cmd1 = new MySqlCommand("SELECT COUNT(*) FROM employee", con))
                    {
                        con.Open();
                        countrow = Convert.ToInt32(cmd1.ExecuteScalar());
                        con.Close();
                    }

                    for (int i = 0; i < dataGrid.Items.Count; i++)
                    {
                        object item = dataGrid.Items[i];
                        showid       = (dataGrid.SelectedCells[1].Column.GetCellContent(item) as TextBlock).Text;
                        showname     = (dataGrid.SelectedCells[2].Column.GetCellContent(item) as TextBlock).Text;
                        showlastname = (dataGrid.SelectedCells[3].Column.GetCellContent(item) as TextBlock).Text;

                        con.Open();
                        string          readersql2 = "select * from checkwork WHERE (checkDate BETWEEN '" + Convert.ToDateTime(datePick1.Text).ToString("yyyy-MM-dd") + "' AND '" + Convert.ToDateTime(datePick2.Text).ToString("yyyy-MM-dd") + "') AND (checkID='" + showid + "')";
                        MySqlCommand    commandna  = new MySqlCommand(readersql2, con);
                        MySqlDataReader readerdata = commandna.ExecuteReader();

                        while (readerdata.Read())
                        {
                            value   += Convert.ToInt32(readerdata["checkPay"]);
                            getvalue = value;
                        }
                        value = 0;
                        con.Close();

                        countloop += 1;

                        if (countloop == countrow)
                        {
                            break;
                        }

                        con.Open();
                        MySqlCommand cmd2 = new MySqlCommand();
                        cmd2.Connection  = con;
                        cmd2.CommandText = @"INSERT INTO salary (sMonth,empID,sName,sLastname,sSalary,sSave) VALUES (@Date,@ID,@NAME,@LASTNAME,@SALARY,now())";
                        cmd2.Parameters.AddWithValue("@Date", Convert.ToDateTime(datePick2.Text).ToString("yyyy-MM-dd"));
                        cmd2.Parameters.AddWithValue("@ID", showid);
                        cmd2.Parameters.AddWithValue("@NAME", showname);
                        cmd2.Parameters.AddWithValue("@LASTNAME", showlastname);
                        cmd2.Parameters.AddWithValue("@SALARY", getvalue);
                        cmd2.ExecuteNonQuery();
                        cmd2.Parameters.Clear();
                        con.Close();
                    }
                    MessageBox.Show("บันทึกเรียบร้อยแล้ว");
                    CalcuateSalary go = new CalcuateSalary();
                    this.Close();
                    go.Show();
                }
            }
        }