c# - Can't find HTML control in codebehind -

c# - Can't find HTML control in codebehind -

i have div (id=main), contains 15 html select controls within , ids ddl1, ddl2, ddl3, ... , on.

now want dynamically select or assign indexes xml file, wrote code.

private void readxml(string spath) { xmldocument doc = new xmldocument(); doc.load(spath); //doc.loadxml(spath); xmlnodelist xmlnodes = doc.selectnodes("/hedge/*"); (int i=1; <= 15; i++) { (main.findcontrol("ddl" + i) dropdownlist).selectedindex = int32.parse(xmlnodes[i].innertext); } }

but error occuring here...

object reference not set instance of object.

it's maybe because it's not able find controls (html select controls)... can tell me reason or solve problem?

there 2 thing may have went wrong. 1 obvious

(main.findcontrol("ddl" + i) dropdownlist).selectedindex = int32.parse(xmlnodes[i].innertext);

since not using asp.net dropdown list can not cast this. should be

(main.findcontrol("ddl" + i) htmlselect).selectedindex = int32.parse(xmlnodes[i].innertext);

another attribute runat="server" needs there if suing html controls , want access on c# page.

<select id="select1" runat="server"> <option value="1" selected="true"> item 1 </option> ..... </select>

c# asp.net xml