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welcome along my name is chris and in this video i'll show you how you can add intuitive flexible model validation to your asp.net core project using the fluent validation library now the example i'll be using in this video is a web api project but the implementation is very similar to mvc if this is your first time here and you like this kind of content if it's useful to you please do consider subscribing and tapping the bell icon below to receive notifications with that let's get started i have an asp.net core web api project that is going to be the back end for a very important and unique to-do list app tasks are represented by a task item model that has the following properties a description of the task which is a string a due date a date time of course a flag remind me which the user can set to true if they want to receive a reminder just before their task is due we have a nullable integer reminder minutes before due this sets how many minutes before the task is due a reminder is sent if the remind me flag is true and finally we have a simple list of strings that the user can set to specify sub items on the task i've also created a tasks controller with a post endpoint that will allow consumers of my api to create new tasks on their to-do lists my post endpoint takes a task item instance as a parameter which the mvc model binder will attempt to create from the incoming post request body at the moment i'm using the out of the box default model binder and model validation and the problem with this is that if i were to send a blank request into my post endpoint the model binder would create a task item with an empty description and a date time with a min value it also wouldn't perform any validation on the checklist or the requested value on the minutes before due field i could of course use the built-in asp.net core validation attributes to achieve some of this but i want a lot more flexibility than they allow and i want to be able to create some advanced validation rules so i'll use the fluent validation package instead i've installed the fluent validation package for asp.net core using the command dot net add package fluentvalidation.asp core this package includes fluent validation and all of the extra good stuff required to work with and plug into asp.net core's middleware pipeline so with fluent validation instead of adding attributes to our task item class directly we'll define our rules on a new class which inherits from a special base class called abstractvalidator so let's first add the namespace using fluentvalidation and then create a class task item validator we'll base task item validator on the abstract eval database class and then pass in task item as a type parameter...