大家好，我是新手，刚遇到一个连接数据库的问题

为什么能显示插入成功，但是数据库中却没有插入到的数据，这是为什么
namespace 数据库
{
    class Program
    {
        static void Main(string[] args)
        {
            string dateDir = AppDomain.CurrentDomain.BaseDirectory;
            if (dateDir.EndsWith(@"\bin\Debug\") || dateDir.EndsWith(@"\bin\Release\"))
            {
                dateDir = (dateDir).Parent.Parent.FullName;
                AppDomain.CurrentDomain.SetData("DateDirectory", dateDir);
            }



            using (SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;
AttachDbFilename=|DataDirectory|\Database1.mdf;Integrated Security=True;User Instance=True"))
            {
                conn.Open();


                using (SqlCommand cmd = conn.CreateCommand())
                {
                     = "insert into Table1(names)values('aaa')";
                    cmd.ExecuteNonQuery();
                    Console.WriteLine("插入成功");
                }
            
            }
            Console.ReadKey();
        }
    }
}