asp.net-mvc

How can I cleanly share a Custom Validator (ValidationAttribute) for a data model, a ViewModel, and a DTO in ASP.NET

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I’m doing a ASP.NET MVC course. I’m building a REST Web API using ASP.NET WebAPI 2. The application also contains standard MVC 5 views. I’m using DTOs (Data Transfer Objects) to decouple the API from the data model. I’ve made a custom ValidationAttribute that I have applied to a property in my data model, and I’d like to use the same Validation attribute for a property on my DTO as well as a property ViewModel used in an MVC view.

Comparing two table IDs. ASP.NET MVC

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I am currently loading two Orders and Colors tables, I wanted the Colors table to list the items that have the ID equal to Orders. For this, what occurred to me was to assign the IdOrders values ​​to a variable and compare it with my IdOrders (in my table Colors), but it is not possible to assign the database’s balance to my variable

Why isn’t my form passing the id to the controller?

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I’ve got an asp.net mvc webpage set up. All of my actions, like: create, edit, etc… have their own views, except delete, because I’m trying to pop up a modal with help from Bootstrap. I pass an id to the modal, through jQuery/JavaScript, and with the asp-action as the form’s attribute, it should theoretically work, but well it doesn’t.