Solved: asp.net webform with dropZone

I have the code below UI with DropZone.
When submitbutton is clicked. I want to do the following.

Validate extension to jpg and gif only

Upload to directory c:\temp\

How can do that in Javascript?

function submit()
{
???
}

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="Mvc4Application_Basic.WebForm1" %>

    <!DOCTYPE html>

    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <title></title>
        <script src="https://raw.github.com/enyo/dropzone/master/downloads/dropzone.js"></script>
        <link href="http://www.dropzonejs.com/css/general.css?v=7" rel="stylesheet" />
    </head>
    <body>
        <form id="frmMain" runat="server" class="dropzone">
            <div>
                <div class="fallback">
                    <input name="file" type="file" multiple />
                     <a id="submitbutton" name="submitbutton"   class="button special" onclick="submit()">Submit Now</a>  
                    <a>
                </div>
            </div>
        </form>
    </body>
    </html>

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