https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.components.forms.dataannotationsvalidator?view=aspnetcore-7.0
DataAnnotationsValidator Class (Microsoft.AspNetCore.Components.Forms) | Microsoft Learn
Adds Data Annotations validation support to an EditContext.
classmicrosoftaspnetcorecomponentsforms
https://www.syncfusion.com/forums/179577/dataannotationsvalidator-not-working
DataAnnotationsValidator not working. | Blazor | TreeGrid | Syncfusion
Forum Thread - TreeGrid - DataAnnotationsValidator not working.. Browse other users' questions about our Blazor TreeGrid components.
not workingblazortreegridsyncfusion