รบกวนดูให้หน่อยค่ะ คีย์เพิ่มข้อมูลรหัสเข้าแล้ว มันไม่เพิ่มข้อมูลเข้าไปที่ ดาต้าเบสให้เลยค่ะ

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Data.SqlClient;
using System.Text;
using System.Windows.Forms;

namespace CAR_PARK
{
    public partial class Form7 : Form
    {
        string IDIn = "";
        public Form7(string data1, string data2, string data3, Form2 f)
        {
            InitializeComponent();
            label2.Text = data1;
            label5.Text = data2;
            label6.Text = data3;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                string con = contocarpark.con;
                SqlConnection cn = new SqlConnection(con);

                cn.Open();
                DataSet ds = new DataSet();
                SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM DAILY_LOG_ZONE", cn);
                da.Fill(ds, "combolist");
                comboBox1.DataSource = ds;
                comboBox1.DisplayMember = "combolist.ZONE_NAME";
                comboBox1.ValueMember = "combolist.ZONE_ID";
                cn.Close();
                tbInId.Focus();
            }
            catch (Exception)
           {
               MessageBox.Show("เกิดข้อผิดพลาดติดต่อผู้ดูแลระบบด่วน!", "ฐานข้อมูลผิดพลาด", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            label10.Text = DateTime.Now.ToString("dd/MM/yyyy");
        }

        private void timer2_Tick(object sender, EventArgs e)
        {
            label9.Text = DateTime.Now.ToString("HH:mm:ss");
        }

        private string RetrurnDate(string carin)
        {
            string DateXResult;
            if (carin != "" | carin != null)
            {
                System.DateTime convertdate = DateTime.Parse(carin);
                System.DateTime convertdateformat = DateTime.Parse(convertdate.ToString("yyyy/M/d HH:mm:ss", new System.Globalization.CultureInfo("en-US")));
                DateXResult = convertdateformat.ToString();
                return DateXResult;
            }
            else
            {
                DateXResult = "";
                return DateXResult;
            }
        }

        private void tbInId_KeyPress(object sender, KeyPressEventArgs e)
        {
            try
            {
                string text1 = tbInId.Text;
                tbInId.Text = "";
                tbInId.Focus();
                if (text1.Length == 7)
                {
                    e.Handled = true;
                    IDIn = text1;
                    string carin = DateTime.Now.ToString();
                    string carinformat = RetrurnDate(carin);
                    string carinforuse = Convert.ToDateTime(carinformat).ToString("yyyy/MM/dd HH:mm:ss");
                    string con = contocarpark.con;
                    SqlConnection Conn = new SqlConnection(con);
                    Conn.Open();
                    String sql = "INSERT INTO DAILY_LOG_PARK(QUEUE_NO,ZONE_ID,TIME_IN) VALUES ('" + tbInId.Text + "'," + comboBox1.SelectedValue.GetHashCode() + ",'" + carinforuse + "')";
                    SqlCommand cmd = new SqlCommand(sql, Conn);
                    cmd.Parameters.AddWithValue("QUEUE_NO", tbInId.Text);
                    cmd.Parameters.AddWithValue("ZONE_ID", comboBox1.SelectedValue.GetHashCode());
                    cmd.Parameters.AddWithValue("TIME_IN", carinforuse);
                    cmd.ExecuteNonQuery();
                    Conn.Close();
                    tbInId.Text = "";
                    tbInId.Focus();

                    //MessageBox.Show("Save Successfully");
                }
                else
                {

                }
            }
            catch (Exception)
            {
                MessageBox.Show("เกิดข้อผิดพลาดติดต่อผู้ดูแลระบบด่วน!", "รหัสผิดพลาด", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void ComboBox1_Selectedvalue(object sender, EventArgs e)
        {
            try
            {
                string con = contocarpark.con;
                SqlConnection cn = new SqlConnection(con);

                cn.Open();
                DataSet ds = new DataSet();
                SqlDataAdapter da= new SqlDataAdapter("SELECT * FROM DAILY_LOG_ZONE", cn);
                da.Fill(ds, "combolist");
                comboBox1.DataSource = ds;
                comboBox1.DisplayMember = "combolist.ZONE_NAME";
                comboBox1.ValueMember = "combolist.ZONE_ID";
                cn.Close();
                tbInId.Focus();
            }
            catch (Exception)
            {
                MessageBox.Show("เกิดข้อผิดพลาดติดต่อผู้ดูแลระบบด่วน!", "ฐานข้อมูลผิดพลาด", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

    }
}

StringBuilder sql = new StringBuilder(); // เพิ่มตรงนี้ครับ
sql = "INSERT INTO DAILY_LOG_PARK(QUEUE_NO,ZONE_ID,TIME_IN) VALUES ('" + tbInId.Text + "'," + comboBox1.SelectedValue.GetHashCode() + ",'" + carinforuse + "')";