Get File Size

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I have to save a document in MS SQL server database in column of varBinary(max) format. My Problem is that before saving the document I have to check the size of the file because each user has a 2MB size limit. How can take file size from ASP.NET FileUpload.

Thanks in advance!

Posted 21-Jan-11 1:41am

qasimidl

Updated 21-Jan-11 2:19am

Manfred Rudolf Bihy

v2

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2 solutions

Solution 2

Apart from what Dylan already said,

You can use third party controls for this purpose. Some of them are:

Ajax Uploader
SWFUpload
RAD Upload

Hope that helps!

Posted 21-Jan-11 2:38am

Ankur^\m/

Updated 21-Jan-11 2:40am

v2

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Dylan Morley · Accepted Answer · 2011-01-21T01:53:00

Solution 1

You can set the maximum file size allowed in your web.config by modifying the httpRunTime element

http://programming.top54u.com/post/ASP-Net-FileUpload-Size-Limit-Example.aspx[^]

e.g

<httpRuntime maxRequestLength="2048" />

You can also have a look at something like in this thread

http://bytes.com/topic/asp-net/answers/446834-how-check-filesize-using-fileupload-control[^]

VB

Protected Sub Upload_Click () Handles As Upload.Click
If FileUpload1.PostedFile.ContentLength > 10240 then
    lblMessage.Text = "File is too large."
Else
    FileUpload1.PostedFile.SaveAs(Location)
End If
End Sub

You can't reliably get the file size from any client scripting languages, file manipulation on the client would be a large security hole.

Posted 21-Jan-11 1:53am

Dylan Morley

Comments

Manfred Rudolf Bihy 21-Jan-11 8:21am

Good call! 5+

Ankur^\m/ 21-Jan-11 8:25am

file manipulation on the client would be a large security hole
Google does it in Gmail. I think topic was discussed here long back and someone told how Google does it. Let me search it.

Dylan Morley 21-Jan-11 8:33am

Probably going to be something like using swf and passing it through a flash variable.

I'm sure there are ways, but that's why I said you can't do it reliably. You don't know if the user is allowing flash content (I use flashblock on FF).

I'm sure you'd explicitly need to allow some sort of access to your FileSystem, otherwise it could wreak havoc!

Ankur^\m/ 21-Jan-11 8:44am

That's correct. AFAIK, Google uses flash to do it. But as I said, this topic was discussed long back and someone gave a link on how Google does it and IIRC it was without flash. I will try to find out that post, but I am not sure it was here or in the Lounge. Let me search and see.