解决方法如下：
　　SqlCommand sold_cmd = new SqlCommand(sql_sold,conn);
　　sold_cmd.CommandTimeout = 300;
　　SqlCommand detail_cmd = new SqlCommand(sql_detail,conn);
　　detail_cmd.CommandTimeout = 300;
　　sqlDA_sold.SelectCommand = sold_cmd;
　　sqlDA_detail.SelectCommand = detail_cmd;考试大等级站收集整理!