如何在windowsform中用c#连接sql数据库服务器和用户控件？

using System;
using System.Data.SqlClient;

namespace WindowsFormsApp
{
    public partial class Form1 : Form
    {
        private SqlConnection connection;
        private SqlDataAdapter dataAdapter;
        private DataTable dataTable;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string connectionString = "Data Source=服务器地址;Initial Catalog=数据库名称;User ID=用户名;Password=密码";
            connection = new SqlConnection(connectionString);
            dataAdapter = new SqlDataAdapter("SELECT * FROM 表名", connection);
            dataTable = new DataTable();
            dataAdapter.Fill(dataTable);
            dataGridView.DataSource = dataTable;
        }
    }
}