using System.Data.SqlClient;

static void Main(string[] args)        {            string connString = @"Data Source=.; Initial Catalog=lh0216; User ID=sa;pwd=Founder123";            //出了using括號objConnection類會被自動釋放            using (SqlConnection objConnection = new SqlConnection(connString))            {                objConnection.Open();                Console.WriteLine("數據庫連接成功。");                           }                        Console.ReadKey();        }