asp.net multiple file upload with progress bar 

Step 1 : Create new asp.net web application project. Name it Demo. 
 
Step 2 : Add a New Folder to the project. Name it Uploads. 
 
Step 3 : Add a new Generic Handler to the project. Name it UploadHandler.ashx. Copy and paste the following code 
 
using System.IO;
using System.Web;
namespace Demo
{
    public class UploadHandler : IHttpHandler
    {
 
        public void ProcessRequest(HttpContext context)
        {
            if (context.Request.Files.Count > 0)
            {
                HttpFileCollection selectedFiles = context.Request.Files;
                for (int i = 0; i < selectedFiles.Count; i++)
                {
                    System.Threading.Thread.Sleep(1000);
                    HttpPostedFile PostedFile = selectedFiles[i];
                    string FileName = context.Server.MapPath("~/Uploads/"
                        + Path.GetFileName(PostedFile.FileName));
                    PostedFile.SaveAs(FileName);
                }
            }
        }
 
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}
 
Step 4 : Add a WebForm to the project. Name it WebForm1.aspx. Copy and paste the following HTML and jQuery code
 
<%@ Page Language="C#" AutoEventWireup="true"
    CodeBehind="WebForm1.aspx.cs" Inherits="Demo.WebForm1" %>
 
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="jquery-1.11.2.js"></script>
    <script src="jquery-ui.js"></script>
    <link href="jquery-ui.css" rel="stylesheet" />
    <script type="text/javascript">
        $(document).ready(function () {
            $("#btnUpload").click(function (event) {
                var files = $("#FileUpload1")[0].files;
                if (files.length > 0) {
                    var formData = new FormData();
                    for (var i = 0; i < files.length; i++) {
                        formData.append(files[i].name, files[i]);
                    }
 
                    var progressbarLabel = $('#progressBar-label');
                    var progressbarDiv = $('#progressbar');
 
                    $.ajax({
                        url: 'UploadHandler.ashx',
                        method: 'post',
                        data: formData,
                        contentType: false,
                        processData: false,
                        success: function () {
                            progressbarLabel.text('Complete');
                            progressbarDiv.fadeOut(2000);
                        },
                        error: function (err) {
                            alert(err.statusText);
                        }
                    });
 
                    progressbarLabel.text('Uploading...');
                    progressbarDiv.progressbar({
                        value: false
                    }).fadeIn(500);
                }
            });
        });
    </script>
</head>
<body style="font-family: Arial">
    <form id="form1" runat="server">
        Select Files :
        <asp:FileUpload ID="FileUpload1" runat="server" AllowMultiple="true" />
        <br /><br />
        <input type="button" id="btnUpload" value="Upload Files" />
        <br /><br />
        <div style="width: 300px">
            <div id="progressbar" style="position: relative; display: none">
                <span style="position: absolute; left: 35%; top: 20%" id="progressBar-label">
                    Uploading...
                </span>
            </div>
        </div>
    </form>
</body>
</html>
 
Please note : contentType option should be set to false to tell jQuery to not set any content type header. processData option should also be set to false, otherwise, jQuery will try to convert your FormData into a string, which will fail. 

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