Добавить запись с textbox в БД SQL

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
 
namespace WindowsFormsApplication1._1
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection connection = new SqlConnection(@"Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Probnaay.mdf;Integrated Security=True;Connect Timeout=30");
            {
 
                SqlCommand command = new SqlCommand("INSERT INTO Table_1(sd, sdf, dsf, sssdf) VALUES(@sd, @sdf, @dsf,@sssdf)", connection);
                command.Parameters.AddWithValue("@sd", textBox1.Text);
                command.Parameters.AddWithValue("@sdf", textBox2.Text);
                command.Parameters.AddWithValue("@dsf", textBox3.Text);
                command.Parameters.AddWithValue("@sssdf", textBox4.Text);
 
                connection.Open();
                command.ExecuteNonQuery();
                connection.Close();
            }
        }
    }
}