c# - How to show a error message when wrong file uploaded other than(jpeg) in ajax_uploadfile asp.net using jquery? -

i working on asp.net ajax_uploadfile here need show error message had given allowedfiletypes="jpg,jpeg,png"

here code:

 <asp:ajaxfileupload runat="server"  throbberid="throbber"         id="upfile" allowedfiletypes="pdf" onchange="callingerrormesage()"         maximumnumberoffiles="5" onclientuploadcomplete="file_upload" /> 

here script code:

<scrpt>     function callingerrormesage(){         alert(1);     } </script> 

here code behind:

protected void file_upload(object sender, ajaxfileuploadeventargs e) {     string filename = e.filename;     string strdestpath = server.mappath("~/documents/");     ajaxfileupload1.saveas(@strdestpath + filename);         }  

when uploaded jpeg file it's working fine when need upload other jpeg file need show error message

i had given onchange="callingerrormesage()" not working please me on this?

you should validate before uploading this:

$("input:file").change(function () {     if ($(this).val() !== "") {         var ul_file = $(this).val();         var extension = ul_file.substr((ul_file.lastindexof('.') + 1));         var accepted_file_endings = ["jpg", "jpeg"];         extension = extension.tolowercase()         if ($.inarray(extension, accepted_file_endings) !== -1) {         ...         //send file