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！