在WebConfig中配置数据库连接字符串，代码如下：

<connectionStrings>

        <add name="ConnectionString" connectionString="user id=用户名;password=密码;initial catalog=数据库名称;data source=服务器名称"/>

  </connectionStrings>

然后在Webform_1.aspx.cs里面获取连接字符串，要添加如下引用；

using System.Configuration;

using System.Data;

using System.Data.SqlClient;

 

代码：

SqlConnection con;

        protected void Page_Load(object sender, EventArgs e)

        {

            ConnectDB();

        }

private void ConnectDB()

        {

            string ConString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

            con = new SqlConnection(ConString);

            con.Open();

            SqlCommand com = new SqlCommand();

            SqlDataReader sdr;

            string sqlstr = "select * from item";

            com.CommandText = sqlstr;

            com.Connection = con;

            sdr = com.ExecuteReader();

            while (sdr.Read())

            {

                Response.Write(sdr["字段名"].ToString()+"</br>");

            }

            sdr.Close();

            sdr = null;

           

        }

这样就可以了，非常简单，初学asp.net ，希望朋友们多指教，感激不尽！！！！！！！！！！！！！