Advanced Form Validation in Blazor 10

Blazor in .NET 10 introduces native support for validating nested objects and collections in forms, addressing a long-standing limitation. Key additions include the `AddValidation()` service registration, the `[ValidatableType]` attribute for triggering source-generated validation logic, and seamless integration with `IValidatableObject` for cross-field business rules. The post also demonstrates using the new `EditContext.IsValid(fieldIdentifier)` method to drive visual section-level feedback via CSS class providers, all illustrated through a practical event registration form built with Telerik UI for Blazor.