從數據讀取資料方法

      自己初學C＃，感覺從數據據庫獲取資料挺難的，有點恐俱感。雖然自己有點怕，但我還是努力去學！今天做了一個小程式－－從數據庫中獲得資料輸出到控制台上。

using System.Data.SqlClient;
static void Main(string[] args)
        {
            #region  連接數據庫
            SqlConnection dataConnection = new SqlConnection();
            string userName = "sa";
            string password = "sh2_123";
            dataConnection.ConnectionString = "User ID=" + userName + ";Password=" + password +";Initial Catalog=Northwind;" + "Data Source=CCM02\\SQLEXPRESS";
            dataConnection.Open();
            #endregion  
           
            #region 執行語句
            SqlCommand dataCommand = new SqlCommand();
            dataCommand.Connection = dataConnection;
            dataCommand.CommandText = "select OrderID,OrderDate,ShippedDate,ShipName,ShipAddress,ShipCity,ShipCountry From Orders Where CustomerID='BLONP'";
            SqlDataReader datareader = dataCommand.ExecuteReader();    
            #endregion      
            
            #region 輸出得到資料
            while (datareader.Read())
            { 
                #region 定義變量對應到欄位
                int orderId = datareader.GetInt32(0);
                DateTime orderDate = datareader.GetDateTime(1);
                DateTime shipDate = datareader.GetDateTime(2);
                string shipName = datareader.GetString(3);
                string shipAddress = datareader.GetString(4);
                string shipCity = datareader.GetString(5);
                string shipCountry = datareader.GetString(6);
                #endregion

                Console.WriteLine(
                    "Order {0}\n placed {1} \n shipped {2} \n" +
                    "To Address {3} \n {4} \n {5} \n {6} \n\n",
                    orderId, orderDate, shipDate, shipName, shipAddress, shipCity, shipCountry);
            }
            #endregion
        }