ASP.NET

21-Dec-06 2:15

The maximum file size is controlled via config file. The maximum size for .NET1/1.1 is 1GB. For .NET2 it is 2GB. By default, the size is 4096K (4MB). To change the size, you specify the following:

<httpRuntime maxRequestLength="value in K" executionTimeout="3600" />

It is not a good idea to let this value get too big because ASP.NET loads the item into memory as it is uploading, so large values quite often result in Out of Memory exceptions.

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Re: ASP.NET File Upload

sdaniel_cst21-Dec-06 2:19

sdaniel_cst

21-Dec-06 2:19

Thanks very much for your reply...

sdaniel_cst

lokeshgupta1321-Dec-06 2:01

21-Dec-06 2:01

If user is uplaoding large file through the application, then i want to allow them to do other work on the site. Means if a thread is processing file uplaod functionality then i want them to allow other works on the appllication.

Problem in Asynchronous call:

In this solution, i tried to execute, uploading functionality in to separate thread. For that, I created separate thread using delegate.BeginInvoke() method. Now, problem is that, In asynchronous call, I am able to upload file only in that case, when response from main thread is not returned. Once a response from main thread generated and sent back to the client then second thread gets “file not found” exception.

Problem in Popup window:

If i use popup window to open "file upload page", then that page will open in new window. Now, problem is that, if any processing is happening in this page at server side and user tries to do different things on other window (make a call to execute on the server e.g.. Click on “Cancel” link) then processing of this request queued until processing of "Upload File" page is not completed. Means request are performed sequentially.

I want them to allow user to do different task at the same time.

I am using ASP.NET 1.1.

If some one has any solution them please do the needful.

Thanks
Lokesh Gupta
.Net Developer

Guffa21-Dec-06 2:58

Guffa

21-Dec-06 2:58

The reason that you can't do anything else while the file is uploaded, is that the web server only allows one page at a time to run for each user.

The solution is to disable SessionState for one of the pages.

---
It's amazing to see how much work some people will go through just to avoid a little bit of work.

lokeshgupta1321-Dec-06 19:21

21-Dec-06 19:21

Hi Guffa,

Thanks for updating me.I tried it in sample application and it worked fine. I found that, two saperate pages processed simultanenously using different threads.

But when i tried it in my application, it didn't worked.

I disabled sesionState for "Upload File" page, which open in popup window. Now, if uploading is going on and at the same time, if i wanted to do different things on different pages, then i found that, request were queued. I am not getting, where i am going wrong. Can you guess, what other settings may cause this to not happend?

Is there any other way to achieve the same without disabling the SessionState?
Means by managing threads in code.

Thanks
Lokesh Gupta

Guffa21-Dec-06 21:15

Guffa

21-Dec-06 21:15

lokeshgupta13 wrote:
Thanks for updating me.I tried it in sample application and it worked fine. I found that, two saperate pages processed simultanenously using different threads.

Then one of them is not processing the page any more, just running in the background. Once you end the response, it doesn't matter if you have a thread running in the background. This of course means that the background thread can't send anything to the browser any more, as the response has ended.

lokeshgupta13 wrote:
I disabled sesionState for "Upload File" page

Is that the page containing the upload form, or the page that is recieving the file? Or are they the same? The page recieving the file has to be sessionless, as that's the one running while the file is uploading.

I have myself written an upload application that used a sessionless page for displaying upload progress, so I know that it's possible to do it this way.

lokeshgupta13 wrote:
Is there any other way to achieve the same without disabling the SessionState?

Not unless you can get rid of the single page limitation in the IIS, but I really doubt that is possible. That could introduce threading issues, as you will have several threads running against the same session object. Also it would make the server much more sensetive to DoS attacks.

---
It's amazing to see how much work some people will go through just to avoid a little bit of work.

lokeshgupta1322-Dec-06 19:40

22-Dec-06 19:40

In my case both the "Upload Form" and "Receiving form" are the same. I am using same form. I am not getting what is going wrong.

Thanks

Guffa22-Dec-06 19:45

Guffa

22-Dec-06 19:45

Have you verified that trying to access the Session object in the page gives an excception, so that you are sure that the page is session-less?

---
It's amazing to see how much work some people will go through just to avoid a little bit of work.

lokeshgupta1322-Dec-06 20:56

not able to write to file in asp.net.

22-Dec-06 20:56

Yes, i tried and it throughs an exception.

rama charan21-Dec-06 2:00

rama charan

21-Dec-06 2:00

i am using vs2003

i want to write some text into an existing file present at server side using asp.net but it gives me an exception named
----->System.UnauthorizedAccessException: <------

so i need how to get permission to write file to server
any suggestions are also welcome

the code i used is given below---

Dim fs As New FileStream("C:\Inetpub\wwwroot\wa_readfromcsv\textfile_as_csv.txt", FileMode.Create, FileAccess.Write)
Dim s As New StreamWriter(fs)
s.WriteLine("This is an example of using file handling concepts in VB.NET.")
s.WriteLine("This concept is interesting.")
s.Close()

------- the exact error shown is ---------
' Exception Details: System.UnauthorizedAccessException:
' Access to the path "C:\Inetpub\wwwroot\wa_readfromcsv\textfile_as_csv.txt" is denied.

'ASP.NET is not authorized to access the requested resource.
'Consider granting access rights to the resource to the ASP.NET request identity.
'ASP.NET has a base process identity (typically {MACHINE}\ASPNET on IIS 5
'or Network Service on IIS 6) that is used if the application is
'not impersonating. If the application is impersonating via <identity impersonate="true">,
'the identity will be the anonymous user (typically IUSR_MACHINENAME) or the authenticated request user.

'To grant ASP.NET write access to a file, right-click the file in Explorer,
'choose "Properties" and select the Security tab.
'Click "Add" to add the appropriate user or group.
' Highlight the ASP.NET account, and check the boxes for the desired access.

thanks in advance for your help and time...

Pete O'Hanlon21-Dec-06 2:08

21-Dec-06 2:08

The error message tells you what you need to do. Basically, the ASPNET user does not have write permissions for this directory. You need to grant this user permissions to the directory. Follow the instructions in the error for granting ASPNET access.

Colin Angus Mackay21-Dec-06 2:21

Colin Angus Mackay

21-Dec-06 2:21

Pete O`Hanlon wrote:
The error message tells you what you need to do

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rama charan21-Dec-06 2:24

rama charan

21-Dec-06 2:24

thanks for your reply ..

about the suggested solutions
for first suggested way--- i dont know how to grant permission to the user .

for second way--- i dont think that changing in my system will solve the problem globally because application is web application .does the second solution mean that i need to change in explorer of system where i installed the application ...i dont think so ..even thought i do it is something like i will only use the application at client side it appears...

...so please explain me clearly what the error message says me to do.

Pete O'Hanlon21-Dec-06 2:29

21-Dec-06 2:29

rama charan wrote:
about the suggested solutions
for first suggested way--- i dont know how to grant permission to the user .

for second way--- i dont think that changing in my system will solve the problem globally because application is web application .does the second solution mean that i need to change in explorer of system where i installed the application ...i dont think so ..even thought i do it is something like i will only use the application at client side it appears...

...so please explain me clearly what the error message says me to do.

OK - as you are running this as a web application, then fixing it at the server is enough. Right-click on the directory that you are trying to write this file to, choose Properties and select the Security tab. Click the Add button and choose the ASPNET (if you are running IIS5) or Network Service (if you are running IIS6) user. This user is a local account. Select OK and then choose the relevant permissions at the bottom of the properties dialog. Once you have chosen the permissions to grant, click OK.

T-SQL transaction vs ADO.NET transactions

rama charan21-Dec-06 6:48

rama charan

21-Dec-06 6:48

that was a very clear description thank you very much

but its still not working ....

what does this mean in the error description something with "impersonating"..

" that is used if the application is
'not impersonating. If the application is impersonating via ,
'the identity will be the anonymous user (typically IUSR_MACHINENAME) or the authenticated request user"

i dint get exactly which user to modify ...just assume that i am using a simple webiste and its accessible to all ..so no authentication.

but may be the code has any issue please check the 5 line code also
assume file is already present.

thanks for your effort..

Dinuraj21-Dec-06 1:28

Dinuraj

21-Dec-06 1:28

T-SQL transaction vs ADO.NET transactions
What is the better to use between them?

waiting for prompt reply

Re: T-SQL transaction vs ADO.NET transactions

Pete O'Hanlon21-Dec-06 2:06