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Multiple File Upload Custom Control in ASP.NET

, 23 Sep 2009 CPOL
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There is already a control available in .NET for single upload. There are cases where we actually have requirement of multiple and bulk select upload of files in application so as to achieve this functionality I came up with the solution that will help developer a lot..


We have a scenario where we want to have multiple file upload with one click selection criteria. After a long search in Google, I landed up on The Code Project with the desired solution.The solution I got was not straight forward and it took me tooth and nail to fit the solution in my architecture. So I made some changes to the code that helped me to achieve the multiple upload functionality with the expected output.

Using the Code

The steps that need to be followed so as to make this work for you, are as follows:

  1. Copy Upload.cs and Upload2.cs in your app_code.
  2. Reference flash.dll in your website. This will appear in bin folder.
  3. In the page load of your code behind, copy this code:
    protected void Page_Load(object sender, EventArgs e)
            // allows the JavaScript function to do a postback 
            // and call the onClick method 
            // associated with the linkButton LinkButton1. 
            string jscript = "function UploadComplete()
    	{" + ClientScript.GetPostBackEventReference(LinkButton1, "") + "};";       
    			"FileCompleteUpload", jscript, true); 
  4. Add this tag at the top of the ASPX page where you want your control to display:
    &lt %@ Register Assembly="FlashUpload" Namespace="FlashUpload" 
    	TagPrefix="FlashUpload" %&gt 
  5. Add the below ASPX custom tags inside form tags as follows:
    < FlashUpload:FlashUpload ID="flashUpload" runat="server" UploadPage="Upload2.axd"
    	OnUploadComplete="UploadComplete()" FileTypeDescription="All Files" 
    *.png; *.jpg; *.jpeg"
    	UploadFileSizeLimit="1800000" TotalUploadSizeLimit="2097152" />
     	< asp:LinkButton ID="LinkButton1" runat="server" 
    	OnClick="LinkButton1_Click" > </ asp:LinkButton >
  6. Add the below given tags under system.web in web.config file:
    	<remove verb="*" path="*.asmx"/>
    	<add verb="*" path="*.asmx" validate="false" 
    	System.Web.Extensions, Version=1.0.61025.0, 
    	Culture=neutral, PublicKeyToken=null"/>
    	<add verb="*" path="*_AppService.axd" validate="false" 
    	System.Web.Extensions, Version=1.0.61025.0, 
    	Culture=neutral, PublicKeyToken=null"/>
    	<add verb="GET,HEAD" path="ScriptResource.axd" 
    	type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, 
    	Version=1.0.61025.0, Culture=neutral, 
    	PublicKeyToken=null" validate="false"/>
    	< remove verb="POST,GET" path="Upload.axd"/>
    	< add verb="POST,GET" path="Upload.axd" type="Upload"/>
    	< remove verb="POST,GET" path="Upload2.axd"/>
    	< add verb="POST,GET" path="Upload2.axd" type="Upload"/>

Specify types of files you require need to be uploaded to web server folder. So we are all set and done. Build your application and run the machine.


The above approach may have some implication on security that may require to give access rights to the folder in webserver where your files are going to be saved. Remember this if in production this functionality goes for a toss.


The reference article that helped me to achieve this milestone was "Multiple File Upload With Progress Bar Using Flash and ASP.NET". Thanks to the author darick_c.


  • 23rd September, 2009: Initial post


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

santosh poojari
Technical Lead
India India
Whatsup-->Exploring--> MVC/HTML5/Javascript & Virtualization.......!

Comments and Discussions

QuestionError in loading page [modified] PinmemberMorteza Karimi24-Apr-13 3:09 
QuestionDo you have a version for Production server deployment PinmemberAmarjeetSinghMatharu11-Dec-12 2:53 
QuestionHttp I/O error PinmemberMember 393135026-Mar-12 21:20 
QuestionError: I/O Error: Error #2038 and HTTP Error: status code 302 PinmemberSardorious10-Feb-12 23:35 
AnswerRe: Error: I/O Error: Error #2038 and HTTP Error: status code 302 Pinmemberelmonalgotas23-Apr-12 21:30 
Generalwidth / height? Pinmemberres_web13-Jul-11 6:51 
Generalerror PinmemberRuXiaoMai21-Apr-11 6:40 
GeneralRe: error Pinmemberres_web13-Jul-11 6:47 
Generalreally good article PinmemberMember 37653578-Jul-10 11:27 
GeneralRe: really good article Pinmembersantosh poojari13-Jul-10 4:37 

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