In this article, we will explore the usage of the Fluent Validation library in the Asp.Net Core application. Fluent Validation Library: Fluent Validation is a popular .Net library for enabling validation rules. It has a lot of features like in-built validation rules that are most commonly used in any application and also has flexible support for creating custom rules. Implementing Fluent validation rules is a cleaner approach than using the 'DataAnnotation'(.Net default implementation for applying validation rules). It can be automatically injected into .NetCore model validations without any explicit implementation. How To Implement Fluent Validation To A Model: To apply fluent validation to the model, we have to create a separate validator class. The validator class must inherit from 'FluentValidation.AbstractValidator<TModel>'. Inside of the constructor need to apply required validation for the properties of 'TModel'. public class Student { public