Don't let users to inject you an invalid file! FileTypeChecker is a easy to use library that allows you to read file and recognize its type. This will help you to validate all files that is provided by external sources.
AutoValidator's aim is to create a simple, fluent and intiutive framework to validate data and models in your dotnet applications. Simply put; an application would validate some data and get a result object. That object would state sucess or failure and detail the failing data.
Implementations of ASP.NET Core Identity IPasswordValidators that verify the provided password is not one of the most common passwords. Inspired by Discource and https://blog.codinghorror.com/password-rules-are-bullshit/