Скачать или смотреть Resolving the Issue of ASP.Net FileUpload Limiting File Size to 10 MB

Discover how to effectively troubleshoot and resolve the common problem of the ASP.Net FileUpload control rejecting files larger than 10 MB, while exploring practical and effective workarounds.
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This video is based on the question https://stackoverflow.com/q/77376533/ asked by the user 'starspejd' ( https://stackoverflow.com/u/14664254/ ) and on the answer https://stackoverflow.com/a/77397015/ provided by the user 'starspejd' ( https://stackoverflow.com/u/14664254/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting ASP.Net FileUpload Size Limit Issue

If you’ve ever worked with the FileUpload control in ASP.Net, you might have encountered a frustrating issue where it refuses to accept files larger than 10 MB. This can be particularly annoying if you have set your application to allow uploads of much larger sizes. In this guide, we will explore this problem in detail and discuss potential workarounds, including one that may seem unconventional but proves effective.

Understanding the Problem

When users attempt to upload files greater than 10 MB using the FileUpload control, they may find that:

Files less than 10 MB upload successfully, with their names displayed.

Files exceeding 10 MB do not get selected, and the control simply shows "no file selected".

This is puzzling, especially if you’ve already configured your application settings to allow larger file sizes. Below are the configurations that you might have set in your web.config file:

[[See Video to Reveal this Text or Code Snippet]]

Despite these settings, many developers experience the persistent limitation of around 10 MB.

Finding a Temporary Solution

After extensive troubleshooting, one user found a workaround that might seem silly but delivers results. Instead of relying on a single FileUpload control, they implemented two controls on the same page, which inadvertently allowed file uploads exceeding the limit. Here’s a quick breakdown of their approach:

The first FileUpload control (might be hidden or styled) that does not function properly for uploads over 10 MB.

The second FileUpload control, which acts as the actual uploader and performs successfully even with larger files.

Here’s how the HTML looks with both controls:

[[See Video to Reveal this Text or Code Snippet]]

Why This Works

The reason this solution works is due to the fact that as a user interacts with the second FileUpload, it bypasses the constraints associated with the first one. Interestingly, this behavior highlights a potential bug or limitation in how the ASP.Net front-end handles the file upload events.

Important Considerations

Not Ideal: It is a workaround and not an ideal long-term solution. It may break with updates or under certain conditions.

User Experience: Make sure that the presence of two upload options does not confuse the users.

Testing: Regardless of the workaround, always run thorough tests to ensure that your application functions correctly across different browsers and devices.

Closing Thoughts

While the workaround of implementing two FileUpload controls seems less than elegant, it demonstrates the lengths to which a developer might go to overcome persistent issues within ASP.Net. It's a clever, albeit cumbersome, approach that can save hours of frustration.

If you’re facing similar restrictions with the ASP.Net FileUpload control, consider this workaround while remaining vigilant about eventually seeking a more robust solution.

Let us know if you’ve encountered this problem or if you have alternative solutions to share!