C# มีปัญหาตอนใส่ตัวเลขค้นหาไปแล้วมัน ขึ้นเออเร่อ รบกวนช่วยทีครับ

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 MySql.Data.MySqlClient;
using System.IO;
namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        MySqlConnection connection = new MySqlConnection("");
        MySqlCommand command;
        MySqlDataAdapter da;


        private void button1_Click(object sender, EventArgs e)
        {
            string query = "select * from files where ID= '" +  textBoxID.Text + "'";
            command = new MySqlCommand(query, connection);
            da = new MySqlDataAdapter(command);
            DataTable dt = new DataTable();
            da.Fill(dt);
            textBoxID.Text = dt.Rows[0][0].ToString();
            //set image from mysql database to pictureBox
            byte[] img = (byte[])dt.Rows[0][3];
            MemoryStream ms = new MemoryStream(img);
            pictureBox1.Image = Image.FromStream(ms);
            da.Dispose();
        }


รบกวนช่วยทีนะครับ


    }
}