I am a newbie and have a requirement to upload ~2GB files via form upload.
I am unsure whether the 2GB file will be received as a whole on the "action URL" - (http://localhost:49980/videoupload.aspx) page or will it be received in parts/chunks?
Thanks in advance for clarifying!
Firstly Increasing the Maximum Upload Size
The 4MB default is set in machine.config, but you can override it in you web.config. For instance, to expand the upload limit to 20MB, you'd do this:
Then upload your file in chunk of bytes. ASP.Net: Writing chunks of file..HTTP File upload with resume and Upload Large Files in ASP.NET Using HttpModule.
you can go for this: Recommendations for best ASP.NET file upload tool
For Reference:
Streaming large file uploads to ASP.NET MVC
Multiple File Upload With Progress Bar Using Flash and ASP.NET
Upload large files in .NET
Related
I have developed File Upload web page in ASP.NET. Now user can rename a .exe file to txt or some other extension and upload the same. I want to restrict that. How I can implement that in ASP.NET?
The only safe way to do this is to get the byte [] from the file that has been posted and examine it to determine if the file is indeed in one of the formats you allow the user to upload. You don't need to save the file, you can just get the byte[] from the HttpPostedFile object.
Other than examining the content (looking for magic numbers, for example) there isn't an infallible way to make sure that the user is not attempting to upload something that you don't allow.
I have an ASP.NET 2 application and would like users to upload a file to be processed immediately. The file never needs to be used again, so I don't care to store it on the server as a file somewhere, which hopefully will make it more secure on our end.
Basically, they upload an excel file and I process it and display some results. I do not care to save that excel file for later.
How can I do this?
You can hold the file contents in a MemoryStream.
This will ensure it is not saved to disk.
See What is the best practice for storing a file upload to a MemoryStream (C#)? for details.
In our application , we are using asp.net FileUpload control to upload files.
Requirement is , user should be able to upload only ".doc, .xls , .pdf" files.
System should not allow him to upload other files. To achieve this we are validating the extension of the uploaded file. If it is not valid then throwing error message.. this works fine..
But if i change the any exe file as .doc file , then system is allowing to upload. this should not happen.
Is there any way to validate the file with its content instead of its extension ..?
Check out this question/answer on stackoverflow. I belive this is a duplicate question.
Also, look into reading a file's magic number especially if you are just trying to determine if the file is one of a few acceptable types. Magic number Wikipedia
Uploadify is a good file uploading tool that I have found which allows you to specify which extensions you allow the user to see when uploading their files. It also has alot of other cool options and it is highly customizeable. It uses a combination of jquery and flash to allow the user to upload more than one file at a time as well (if desired).
Going over the file references in a FileReferenceList calling upload on each one means the files are uploaded as separate requests.
I want to upload a bunch of file in one POST (and I already have a ASHX handler that will accept it).
Any ideas?
AFAIK that is not possible.
From the docs:
The FileReferenceList class lets the user select one or more files to upload to a server-side script. The file upload is handled by the FileReference.upload() method, which must be called on each file that the user selects.
...and...
Uploading multiple files requires you to upload each of the selected files by using FileReference.upload()
You could perhaps create a zip with the AS3 zip library and send that to the server.
No you cannot, its a security restriction of the Flash player. You can simulate File upload with Action Script (usefull if you want to send data but no User files).
Its the same with Flash 10, so maybe on Flash 11...
How to make ASP.NET file upload control with resume, without file size limitation and with secure connection?
Any idea?
You can split file to small part.
Upload each part separately. If connection broke, just re upload last part and continue with other.
After all parts are uploaded, just combine all parts on server in one file.