Error Loading Big PDF Document

Problem reported by Nitin Sharma - 1/27/2020 at 1:02 AM

Not A Problem

Below error Occured while displaying 950 MB document, The file is stored in database as stream.

Exception of type 'System.OutOfMemoryException' was thrown

Please advise

12 Replies

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Cem Alacayir Replied

1/27/2020 at 2:49 AM

Employee Post

First make sure you are using latest version Version 5.2.2 - January 24, 2020.

950 MB is a too big document.

> The file is stored in database as stream

How are you passing that stream to DocumentViewer? You should not use a MemoryStream, that will probably cause OutOfMemoryException. Just make sure you are disposing your streams and not storing huge files as bytes in memory. You can also use IDocumentHandler interface.

Nitin Sharma Replied

1/27/2020 at 3:12 AM

Please note that i am passing byte array to a document viewer , it load small documnets very well but when it

comes to big files it gives System.OutOfMemoryException.

i understand that 950 mb is too big file but as per our business model we receive these kind of bigger files.

Ho can i download the latest version?

Nitin Sharma Replied

1/27/2020 at 3:22 AM

Downloaded the latest version still same issue, please help

Cem Alacayir Replied

1/27/2020 at 3:36 AM

Employee Post

> Please note that i am passing byte array to a document viewer

So what can DocumentViewer do about it? You are already storing 950 MB bytes in memory before even passing it to DocumentViewer. So maybe you are getting System.OutOfMemoryException even before your code enters DocumentViewer.

Solutions:

Increase your RAM
Use 64-bit process so more memory is available for .NET (IIS Express runs by default in 32-bit but VS setting can be turned on to run in 64-bit)
Save your big byte arrays to disk as temporary file and then pass the temporary file to DocumentViewer
Try to get a stream from your database instead of a byte array.

Nitin Sharma Replied

1/27/2020 at 3:40 AM

No, Its the document viewer which is giving error,

i tried to pass document directly from local disk without using any byte array or stream and it was still giving out of memory exception

Nitin Sharma Replied

1/27/2020 at 4:40 AM

Please note that big file form local disk is also not loading.

It does mean that document viewer has a file size limit , please can you let us know at least what is the maximum size of file supported by document viewer?

it would be great if you can update document viewer to handle such a large files.

Thank you

Cem Alacayir Replied

1/27/2020 at 4:44 AM

Employee Post

Once you create a 950 MB byte array, it stays in memory until GC (Garbage Collector) triggers and collects the unused byte array (frees the memory). So even if you write it to a temporary file later, 950 MB of your memory is still filled.

You can try this:

//Your byte array should not have any other reference and only reference should be set to null
yourByteArray = null;

//Then trigger GC manually to free up memory
GC.Collect();

Hopefully if GC frees up memory, then probably conversion would succeed.

Nitin Sharma Replied

1/27/2020 at 5:30 AM

Please note that below approach is also having issues with big files

so its not all about disposing the byte array and freeing up GC.

Anyways , Thank you for your kind responses.

Cem Alacayir Replied

1/27/2020 at 5:41 AM

Employee Post

Let me know if running under 64-bit process makes a difference (IIS by default runs in 64-bit mode, IIS Express by default runs in 32-bit mode).

Nivas Haneefa Replied

1/27/2020 at 6:00 AM

Thanks Cem for your kind responses.

I work with Nitin in this project.

It is already running in 64-bit process.

please let us know how to fix this issue . Thanks in advance

Aastha Desai Replied

2/8/2022 at 9:10 PM

Hello,
I am using the below approach for document viewer(version 5.9.7)

filepath = this.Server.MapPath("Any path");

documentViewer.Document = filepath;

Which is causing the System.OutOfMemoryException.

please let us know how to fix this issue. Thanks in advance

Cem Alacayir Replied

2/16/2022 at 1:11 AM

Employee Post

Always test your problem files with our live demo because it uses the latest version (currently v6.0) so it's possible that your problem is already fixed with the latest version:

https://demos.gleamtech.com/documentultimate/AspNetWebFormsCS/#DocumentViewer/Overview.aspx

Don't worry, your uploaded files are automatically deleted after your session expires (they are not public, only the uploader can see them).

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