file - Telerik RadFileExplorer And Server side codes -

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i have file explorer below : 

<%@ page language="c#" autoeventwireup="true" codebehind="searchbar.aspx.cs" inherits="fileexplorer.searchbar" %>  <%@ register assembly="telerik.web.ui" namespace="telerik.web.ui" tagprefix="telerik" %> <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="head1" runat="server">     <title></title>     <script type="text/javascript"> //        function onclientfileopen(oexplorer, args) { //            args.set_cancel(true); //            radopen(args.get_item().get_url()); //        }          function onclientfileopen(oexplorer, args) {             var item = args.get_item();             var fileextension = item.get_extension();              var filedownloadmode = document.getelementbyid("chkbxdownoaldfile").checked;             if ((filedownloadmode == true) && (fileextension == "jpg" || fileextension == "gif")) {// download file                 // file image document, not open new window                 args.set_cancel(true);                  // tell browser open file directly                 var requestimage = "handler.ashx?path=" + item.get_url();                 document.location = requestimage;             }         }     </script> </head> <body>     <form id="form1" runat="server">     <div>         <asp:scriptmanager id="scriptmanager1" runat="server">         </asp:scriptmanager>         <telerik:radwindowmanager id="radwindowmanager1" runat="server">         </telerik:radwindowmanager>         <telerik:radfileexplorer runat="server" id="radfileexplorer1" height="400px" hidth="600px"             enablecreatenewfolder="false" enablecopy="true" onclientfileopen="onclientfileopen" enableopenfile="true">             <configuration viewpaths="~/files" uploadpaths="~/files" deletepaths="~/files" />         </telerik:radfileexplorer>         <br />         <asp:checkbox id="chkbxdownoaldfile" runat="server" text="open images direct download " />     </div>     </form> </body> </html>

the upper codes example , can see demo in below link ...
fileexplorer / filter files , download

i want allow users download file server without preview (just save window)...
purpose can change upper codes easily.

but there situation here -> want capture , filter downloads (file size limit) (sql server 2008 database).
seems radfileexplorer has client side events purpose!
when page loads , want show radfileexplorer user seeing it's files without permission download.
when he/she double clicks on file tell user plz login first!
after his/her logined , he/she can download files 1 gb per day. how can stuff radfileexplorer ?
web service , web methodes idea situation?

thanks in advance

the code using relies on handler - "handler.ashx". files streamed using handler can implement server side restrictions in code. think can use handler redirect browser different page if user not logged in.


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