How to programatically change selected item in dropdown while javascript onchange applied asp.net -

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i have 2 dropdowns , thier hidden field each on codebehind im adding javascript onchange event attribute.add , button perform dynamic actions adding controls @ runtime when click button dropdown reset. in order maintain state have hidden field dropdown selectedvalue hidden field coding ddcity.items.findbyvalue doesnt seems work can help? 

  protected void page_load(object sender, eventargs e)     { ddcountry.attributes.add("onchange", "javascript:bufferaddddcountry('" + ddcountry.clientid + "');");             ddcity.attributes.add("onchange", "javascript:bufferaddddcity('" + ddcity.clientid + "');");}  if (hiddenddcityvalue.text != "0")         {                  ddcity.items.findbyvalue(hiddenddcityvalue.text).selected = true;// dont work          }      if (!ispostback)     {   this.populatecountry();populatecity();}

javascript code

    <script type="text/javascript"> function bufferaddddcountry(objdd) {             try {                 var objhidden = document.getelementbyid('hiddenddcountryvalue');                 objhidden.value = document.getelementbyid(objdd).value;             } catch (e) {                 alert(e);             }         };         function bufferaddddcity(objdd) {             try {                 var objhidden = document.getelementbyid('hiddenddcityvalue');                 objhidden.value = document.getelementbyid(objdd).value;             } catch (e) {                 alert(e);             }         };     </script>

i atlast made working in javascript hope others here code
codebehind pageload

   scriptmanager.registerstartupscript(updatepanel, this.gettype(), "dropdownselectedvaluechange", "javascript:setselectedvalue('" + ddcity.clientid + "','" + hiddenddcityvalue.text +  "');", true);

javascript code

 function setselectedvalue(dropdownlist, selectedvalue) {             var dropdown = document.getelementbyid(dropdownlist);             (var = 0; < dropdown.options.length; i++) {                 if (dropdown.options[i].value == selectedvalue) {                     dropdown.options[i].value = selectedvalue;                     dropdown.options[i].selected = true;                      break;                 }             }             return;         }

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