asp. Net experience

1、dropdownlist Data show that .

use   ddlCtl.selectItem.value = dr[0].toString().Trim();

Or use it
ddlCtl.selectItem.Selected=false;
ddlCtl.Items.FindControlByName["dr[0].toString().Trim()"].Selected=true;
good , It's obvious , Use one of the following .（ individual opinion ）


Because direct assignment will flush out the bound value , If the binding is only in !isPostBack it . After several assignments, you will find ddlCtl The value inside is no longer the original value , Of course, you can do other manual control to deal with , But that's not the right way to solve the problem （ Personal understanding is to solve the problem and try to deal with the source of the problem ）

2、datagrid Show in , If in all 10 Column , There is a column with a value of ：PPM1600+cACO3+cACO5=25kg+2.5kg+2.6kg, and datagrid Not infinite width , Then other columns will be squashed by this column ,datagrid The results displayed will be very ugly （ The height of each row may be very large ）.

The solution is ： If there is such a long case of expression ,.net It is treated as a word , A space must be added in the middle .