Fluent Validation in C# - The Powerful Yet Easy Data Validation Tool

Full courses: https://www.iamtimcorey.com/ Patreon: https://patreon.com/IAmTimCorey Newsletter signup: https://signup.iamtimcorey.com/ Data validation is extremely important. The problem is that it can create a lot of excess code. Plus you end up in the position of having similar validation code throughout your application, violating the DRY principle. In this video, I am going to introduce you to Fluent Validation, a free tool to help make your validation clean, easy to create, and easy to maintain. As a bonus, it even works on models that you don't own and cannot change. 0:00 - Intro 1:00 - Demo application walk-through 2:56 - User input validation 6:04 - Where to put data validation 7:07 - Fluent Validation: adding a reference 9:19 - Implementing Fluent Validation 18:23 - More rules for validation: String length 20:00 - Validation custom error messages 22:28 - Cascading validation errors 23:29 - Input validation: allowed characters 28:44 - Fluent Validation built-in variable names: updating error messages 34:08 - CascadeMode scope 35:49 - DateTime validation 40:41 - Recap and concluding remarks