asp.net連接數據庫

在web.config裏面添加連接字符串：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
   
  <appSettings>
     <add key="datalink" value="server=localhost;uid=sa;password=1234567890;database=demo"/>
  </appSettings>

......

 

頁面CS代碼：

using System.Data.SqlClient;

string con = System.Configuration.ConfigurationSettings.AppSettings["datalink"];

或者

string con = ConfigurationSettings.AppSettings["dataLink"];

...

if(!Page.IsPostBack)
   {
    SqlConnection conn = new SqlConnection(con);
    conn.Open();
    Label1.Text=conn.State.ToString();

    conn.Close();
    Label2.Text = conn.State.ToString();
   }