Error in file upload

  • Thread starter Thread starter Amar
  • Start date Start date
A

Amar

I am trying to upload a file to the webserver through my
asp.net application. The file upload works fine for files
below 50 MB size because i have set the maxrequestlength
property of the <httpruntime> in the machine.config file
as 51200KB. whenever the user tries to upload a file which
is more than 51200KB then, a blank page with DNS error is
shown as soon as the user hits the submit button.
I want to be able to display an error message to the user
if the file size is greater than 50 MB. How do i catch
this error? I have tried using the try catch block in the
submit button onClick() event, but no use. Please post me
detailed answer.
Thanks in advance.
 
Amar said:
I am trying to upload a file to the webserver through my
asp.net application. The file upload works fine for files
below 50 MB size because i have set the maxrequestlength
property of the <httpruntime> in the machine.config file
as 51200KB. whenever the user tries to upload a file which
is more than 51200KB then, a blank page with DNS error is
shown as soon as the user hits the submit button.
I want to be able to display an error message to the user
if the file size is greater than 50 MB. How do i catch
this error? I have tried using the try catch block in the
submit button onClick() event, but no use. Please post me
detailed answer.
Click to expand...

If you are using a RUNAT=SERVER form with an <input type=file /> style
control, you really only have access to the stream of a posted file after
the file has been fully sent. What you'd have to do is permit the clients to
send files larger than the max, and then measure the file only after it has
been fully posted.

The maxrequestlength property is a bit of a security measure, and can't
really be bypassed even for file measuring purposes, not even with try/catch
blocks. For RFC 1867 uploads, I still use .asp a lot of the time, as it is a
bit more permissive about them.

Richard
 
Assuming you use the HTMLInputFile Control to choose your
file to upload then you can do something like this,

HttpPostedFile file = fileUpload.PostedFile;
int fileLen = file.ContentLength;

fileUpload is the HTMLInputFile control name ...

Thanks,
-Shan
 
Thanks Richard and Shan,
I am using the HtmlInputFile control.But Shan where
exactly do you want me to put in your code? becoz,after
the user selects a file to upload and hits Submit, then
the flow of the code does not go into the OnClick() event
of the submit button, if the filesize is > 50 Mb.I checked
this by setting a breakpoint on the first line of the
OnClick event. The aspx page just shows a DNS error page.
Is there a way, that i can check the size of the file
before the user clicks submit maybe.
 
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