配置Web.Config连接数据库

 配置Web.Config连接数据库： 
 <appSettings>
   <add key="con" value="server=. 或(local);database=pubs;uid=sa;pwd=;"></add>
 </appSettings> (SQL Server 2000)

 或

 <appSettings/>
 <connectionStrings>
  <add name="city" connectionString="server=jsz49/SQLEXPRESS或server=(local)/SQLEXPRESS或server=./SQLEXPRESS;database=Study_NET;uid=sa;pwd=123456"/>
 </connectionStrings> (SQL Server 2005 SQL Server 身份验证)

或

  <connectionStrings>
    <add name="MySqlConnection" connectionString="Data Source=./SQLEXPRESS;Initial Catalog=LoginData;Integrated Security=SSPI;"/> (SQL Server 2005 Windows 身份验证)
  </connectionStrings>
页面种Page_Load下代码为：
 SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.AppSettings["con"]);
 con.Open();
 SqlCommand cmd = new SqlCommand("select * from employee", con);
 this.GridView1.DataSource = cmd.ExecuteReader();
 this.GridView1.DataBind();