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string sql= "";
foreach(ListItem item in DropDownList1.Items)
{
sql +=string.Format(" update TableName set EV_value='{0}' where EV_ID={1}",item.Text.item.Value)
}
调用相关数据库操作函数,执行sql
update tablename set EV_Value = '11' where EP_ID = '某一个值'