Secure File Upload Validation In MVC

Why validation is important

File upload features are useful, but they must be handled carefully. This tutorial explains a simple validation approach for image, PDF, and document uploads in MVC applications.

Validation checklist

• Limit maximum file size.
• Allow only expected extensions.
• Check content type.
• Generate safe file names.
• Store files outside sensitive folders when possible.

Practice task

Add image upload to a learning content form and show validation errors when the file is too large or unsupported.