Take advantage of automatic model state validation in ASP.Net Core to avoid tedious manual coding for HTML form validation ...

If validation succeeds, then the code-behind takes over and moves the user on to the next page.<BR><BR>I hope this makes sense.<BR><BR>Any Javascript and ASP.Net masters out there with ideas?

Here's how to integrate the ASP.NET CustomValidator control with client-side code to create a page that uses Ajax and server-side code to validate data at the browser.

Take advantage of FluentValidation to validate your model classes when working with minimal APIs in ASP.NET Core 6.

Adding Client-Side Validation in ASP.NET MVC 3 By having your data annotations implement the IClientValidatable interface, you can make it easy for developers to integrate your client-side validation ...

VS 2010 Express - ASP.NET Validation Controls - Client-side validation not happening ...