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How to Upload files Using JQuery Ajax in ASP.NET 5

One of the very common task in web application is allowing user to upload files from the client machine to Server. usually files are uploaded along with a form submission. But using JQuery and Ajax we can accomplish this task without the entire page post back.In such cases, you can allow a user to select files using the FileUpload server control of ASP.NET and then upload those files to the server through an Ajax request to a generic handler.


  1. Web form
  2. JQuery
  3. Generic handler

Web form

The following web form consists of a file upload control,user can select the file using file upload control and then they click the upload button to upload the selected file to server.
<h3>Upload File using Jquery AJAX in Asp.net</h3>  
                <asp:FileUpload ID=”fupload” runat=”server”  onchange=’prvimg.UpdatePreview(this)’ /></td>  
            <td><asp:Image ID=”imgprv” runat=”server” Height=”90px” Width=”75px”  /></td>  
            <td><asp:Button ID=”btnUpload” runat=”server” cssClass=”button” Text=”Upload Selected File” /></td>  


$(“#btnUpload”).click(function (evt) {  
                var fileUpload = $(“#fupload”).get(0);  
                var files = fileUpload.files;  
                var data = new FormData();  
                for (var i = 0; i < files.length; i++) {  
                    data.append(files[i].name, files[i]);  
                    url: “FileUploadHandler.ashx”,  
                    type: “POST”,  
                    data: data,  
                    contentType: false,  
                    processData: false,  
                    success: function (result) { alert(result); },  
                    error: function (err) {  


<%@ WebHandler Language=”C#” Class=”FileUploadHandler” %>        
using System;    
using System.Web;         
public class FileUploadHandler : IHttpHandler  
    public void ProcessRequest (HttpContext context)  
        if (context.Request.Files.Count > 0)    
            HttpFileCollection files = context.Request.Files;    
            for (int i = 0; i < files.Count; i++)    
                HttpPostedFile file = files[i];    
                string fname = context.Server.MapPath(“~/uploads/” + file.FileName);    
            context.Response.ContentType = “text/plain”;    
            context.Response.Write(“File Uploaded Successfully!”);    
    public bool IsReusable  
            return false;    


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