ado.net-sqlhelper related code

 #region 基础CRUD方法编写
     
        static void ConnectDB()
        {
            //创建数据库连接对象
            string connString = "Server=.;DataBase=CourseManageDB;Uid=sa;Pwd=a123456";
            SqlConnection conn = new SqlConnection(connString);

            //打开连接
            conn.Open();
            if (conn.State == ConnectionState.Open) Console.WriteLine("连接成功！");

            //关闭连接
            conn.Close();

            if (conn.State == ConnectionState.Closed) Console.WriteLine("关闭成功！");
        }

        static void ExecuteInsert()
        {
            //【1】创建连接对象
            string connString = "Server=.;DataBase=CourseManageDB;Uid=sa;Pwd=a123456";
            SqlConnection conn = new SqlConnection(connString);

            //定义sql语句
            string sql = " insert into Course(CourseName, CourseContent, ClassHour, Credit, Categor