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making business rules cleaner with fluent validation: a comprehensive tutorial

fluent validation is a powerful .net library that provides an elegant and fluent api for building strongly-typed validation rules. it allows you to define complex validation logic in a readable and maintainable way, separating it from your core business logic and making your code cleaner and easier to understand.

this tutorial will guide you through the concepts of fluent validation and demonstrate how to use it to improve your application's validation process with clear code examples.

*why use fluent validation?*

before diving into the implementation, let's understand the benefits of using fluent validation:

*separation of concerns:* keeps validation logic separate from your entity classes, promoting cleaner and more maintainable code.
*fluent api:* provides a natural and readable syntax for defining validation rules, making the code easier to understand and modify.
*strongly typed:* works with strongly-typed models, reducing the risk of errors and improving code completion in your ide.
*composable rules:* enables you to create complex validation rules by combining simpler rules.
*testability:* allows you to easily unit test your validation rules.
*customizable:* offers various extension points for customizing validation behavior, such as custom validators and property resolvers.
*integration:* works seamlessly with asp.net core, mvc, and other .net frameworks.

*getting started:*

1. *install the package:*

open your nuget package manager console and install the fluentvalidation package:



2. *define your model:*

let's create a simple `customer` model:



3. *create a validator:*

create a class that inherits from `abstractvalidatort`, where `t` is the model you want to validate (in this case, `customer`). this class will contain the validation rules.



*explanation of the code:*

**`abst ...

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