asp.net数据库操作3——reader

if(!Page.IsPostBack)   {    SqlConnection conn = new SqlConnection(con);    conn.Open();

    string strSql = "select * from 公告";    SqlCommand cm = new SqlCommand(strSql,conn);

    SqlDataReader dataReader = cm.ExecuteReader();    while(dataReader.Read())    {     Response.Write(dataReader.GetString(1));    }

    dataReader.Close();    conn.Close();   }