Adding Filter Action to FileUpload Control of ASP.NET 2.0
page 4 of 6
by Soyuj Kumar Sahoo
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Server Side Approach

In the btnUpload_Click() event of "btnUpload" we have to add the following code, which will check the maximum size of the file and also filter the extension.

Listing 4: Server side filter action

Protected Sub btnUpload_Click(ByVal sender As Object, ByVal e As System.EventArgs) _
 Handles btnUpload.Click
Try
Dim intDocFileLength As Integer = Me.fileDocument.PostedFile.ContentLength
Dim strPostedFileName As String = Me.fileDocument.PostedFile.FileName
 
If intDocFileLength > 4096000 Then '4MB
  Me.lblUploadErr.Text = "Image file size exceeds the limit of 4000 kb."
  Exit Sub
End If
 
If (strPostedFileName <> String.Empty) Then
  Dim strExtn As String = System.IO.Path.GetExtension(strPostedFileName).ToLower
 
  If (strExtn = ".txt"Or (strExtn = ".doc"Or (strExtn = ".rtf"Or _
     (strExtn = ".pdf"Or (strExtn = ".sxw"Or (strExtn = ".odt"Or _
     (strExtn = ".html"Or (strExtn = ".stw"Or (strExtn = ".htm"Or _
     (strExtn = ".sdw"Or (strExtn = ".vor"Then
 
    Dim savePath As String = _
      Server.MapPath(ConfigurationManager.AppSettings("UploadedPath")) & "\"
 
    Me.fileDocument.PostedFile.SaveAs(savePath & _
                                      System.IO.Path.GetFileName(strPostedFileName))
 
    Me.lblUploadErr.Text = "Document uploaded successfully..."
  Else
    Me.lblUploadErr.Text = _
      "Please upload a valid Document with the extenion in : <br>"
    Me.lblUploadErr.Text + = _
      ".txt, .doc, .rtf, .pdf, .sxw, .odt, .stw, .html, .htm, .sdw Or .vor"
  End If
Else
  Me.lblUploadErr.Text = "There is no file to Upload."
End If
Catch ex As Exception
'TODO: Add the Error log entry logic!
End Try
End Sub

Let us move through the codes. The fileDocument.PostedFile.ContentLength property of FileUpload control will give the size of the posted file as bytes and the fileDocument.PostedFile.FileName property will give the file name of the posted one. Then we check for the maximum size which is fixed to 4 MB as 4096000 bytes here. Then we get the file extension using the System.IO.Path.GetExtension() method of the input file. We match the posted extension with our given extensions. If the match satisfies, we do the Uploading action or else we show the error message in label.


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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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