/// 从sql里边:delete from table where id>x and id<y
/// 从后台循环操作:
/// for(int i=0,i<listID.Count,i++)
/// {
/// SqlConnection conn=new SqlConnection(conStr);
/// string sql="delete from table where id="+listID[i];
/// SqlCommand cmd=new SqlCommand(sql,conn);
/// int n= cmd.ExecuteNonQuery();
/// if(n==0)
/// {
/// MessageBox.Show("ID为"+listID[i]+"的记录未能成功删除");
/// }
/// }
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