c# - Pass values + upload file -

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i using asp.net c# , telerik tools. question is, tring pass values

of (textbox, drop down list , file uploaded details) asp page using java script, nothing work , want file content , pass ?? can give me solution? please!

on page1:

<script type="text/javascript">                function getradwindow() {                     var owindow = null;                     if (window.radwindow) owindow = window.radwindow;                     else if (window.frameelement.radwindow) owindow = window.frameelement.radwindow;                     return owindow;                }                function populatecityname(arg) {                    var cityname = document.getelementbyid("cityname");                    cityname.value = arg;                }                 function returntoparent() {                     //create argument returned parent page                     var oarg = new object();                      //get city's name                                oarg.cityname = document.getelementbyid("cityname").value;                     //get reference current radwindow                     var ownd = getradwindow();                         //close radwindow , send argument parent page                     if (oarg.cityname) {                         ownd.close(oarg);                     }                     else {                         alert("please fill field");                     }                 }           </script>

page 2:

 function onclientclose(ownd, args) {                 //get transferred arguments                 var arg = args.get_argument();                 if (arg) {                     var cityname = arg.cityname;              $get("order").innerhtml = "you chose fly <strong>" + cityname + "</strong>";                 }

try using
var cityname = document.getelementbyid('<%= cityname.clientid %>'); instead of 

var cityname = document.getelementbyid("cityname");

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