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();
   }