Adding Filter Action to FileUpload Control of ASP.NET 2.0
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Published: 03 Apr 2008
Abstract
In this article, Soyuj explains the logic to implement the ASP.NET 2.0 FileUpload Control for adding the ability to filter files. After a brief introduction, he discusses both the client and server side approaches with the help of source code. At the end of the article Soyuj also provides a few useful references to learn more about the discussed topic.
by Soyuj Kumar Sahoo
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Introduction

When we need to Upload any file in to our system we need the Browse and Upload action. In the case of Windows application of .NET there is a control called OpenFileDialog which is used for Uploading any file with browsing. Here we can get the file filter action by using the Filter property. For example, we have to Upload only the test files into our system, so we can set the filtering action as: (OpenFileDialog)Object.Filter = "Text files|*.txt; *.doc; *.rtf" in Windows Application of .NET.

So, when windows developers need this type of filtering action in Web Application, they have a option of using asp:FileUpload control of ASP.NET. Unfortunately, we which have no such property to set a filter for doing the file filtering action before Uploading. So we need to develop our own logic to achieve our Objective.

To get the filtering action we have two options in Web Application:  Client side action and Server side action. In this article we will discuss both the possible ways with a step-by-step example to add the file filtering logic in our application.


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User Comments

Title: Adding Filter Action to FileUpload Control of ASP.NET 2.0   
Name: shivesh
Date: 2012-12-13 2:13:51 AM
Comment:
One of the best client side validations i have seen
Title: Fipe Upload Control   
Name: Roland Hentschel
Date: 2012-10-17 5:23:44 AM
Comment:
Hi,

sorry, but I'm really dumb for using ASP.
Couldn't you provide a zipped example ?
Would really like to be able to check the size of a file,
before it is uploaded, that also works in IE <= v9

regards ( -: roland .- )
Title: Thank You   
Name: omar ali
Date: 2012-07-10 5:29:27 AM
Comment:
Thank You
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Title: HELP   
Name: sean
Date: 2012-01-13 4:29:49 PM
Comment:
I was expecting that when I click on Browse button, It will list only different type of text files as specified. can it be done???? please help
Title: vajinismus   
Name: vajinismus
Date: 2011-10-12 10:45:41 AM
Comment:
thanks..
Title: ZIP File cause no validation   
Name: user
Date: 2011-06-23 12:37:52 PM
Comment:
If i select zip it straight away cause my page error :(
Title: Not Working   
Name: Phani337
Date: 2010-01-11 4:41:42 AM
Comment:
Hey man.Before posting just do unit testing.In the array list JPEG ext is not there.But when i am uploading the jpeg file it is simply uploading with out showing any alert message.
Title: Thats a bad way of identifying files   
Name: Mike
Date: 2009-06-15 4:20:42 AM
Comment:
You really shouldn't be using the file extension as an identifier to the type of file. Use the MIME type.
Title: Thanks Buddy!   
Name: Ajinkya
Date: 2009-05-23 12:39:11 AM
Comment:
I think This article is very usefull fou me!
Title: I have a idear   
Name: wwvww
Date: 2009-04-26 6:10:49 AM
Comment:
string fileName=fu.FileName;//fu is a entity of FileUpload
private string GetFileType()
{
return this.fileName.Substring(this.fileName.LastIndexOf("."), this.fileName.Length - this.fileName.LastIndexOf("."));
}
if(GetFileType()!=".doc")
{
HttpContext.Response.Write("please upload the .doc file");
}
Title: What I want is a propertity name of Filer   
Name: wwvww
Date: 2009-04-26 6:01:20 AM
Comment:
the js is too long to read,do you have another better idear?
Title: Please i want FIlter   
Name: Vishakha
Date: 2009-02-23 11:40:58 PM
Comment:
I was expecting that when I click on Browse button, It will list only different type of text files as specified
".xls", ".doc", ".rtf", ".pdf", ".html", ".htm", ".sdw", ".vor"

Where as I am getting various other files too.
I expect it would filter initially and should not validate after it is selected.
Title: There is not any kind of filter i seen,   
Name: Manish
Date: 2009-02-03 1:03:32 AM
Comment:
I was expecting that when I click on Browse button, It will list only different type of text files as specified
".txt", ".doc", ".rtf", ".pdf", ".sxw", ".odt", ".stw", ".html", ".htm", ".sdw", ".vor"

Where as I am getting various other files too.
I expect it would filter initially and should not validate after it is selected.

Thanks
manishwc@gmail.com
Title: How to retrieve File date info?   
Name: NP
Date: 2008-08-14 10:12:15 PM
Comment:
Is there a way to retrieve last modified or created dates for file using the file upload control? I use file upload control to mainly get the file bytes and use it to store file contents in database.
However, my requirement is also to have original file date from client side and to store it in database. I am unable to get the date stamp from client side
Appreciate any help.
Title: File Upload Issue   
Name: Rekha
Date: 2008-07-28 1:37:35 AM
Comment:
Hi..
When I click on the Browse button the Choose File dialog should open in thumbnail view always.. Is this possible and if yes then how?
Pls help
Title: Thanks   
Name: b@2te
Date: 2008-07-22 2:42:06 AM
Comment:
Thanks
Title: Good   
Name: Mr.6
Date: 2008-07-01 2:38:23 AM
Comment:
this article is very good.
Title: Good article   
Name: Mehul Bhuva
Date: 2008-04-09 6:53:20 AM
Comment:
It is a nice article..Keep it up
Title: Excellent Work   
Name: ali raza
Date: 2008-04-08 7:40:38 AM
Comment:
nice article, keep working
Title: File Filters   
Name: Haissam Abdul Malak
Date: 2008-04-03 2:00:41 AM
Comment:
Good article. However, you can use flash and ASP.NET to set the file filters on the open dialog box itself and to upload multiple files at one.
http://dotnetslackers.com/community/blogs/haissam/archive/2008/03/29/upload-multiple-files-using-asp-net-amp-adobe-flex.aspx

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