I didn't know this until my fellow instructor at Learning Tree (and author of Learning Tree's ASP.NET Web Forms course), Kevin Rattan, pointed it out to me: when you trigger validation at the server ...

The goal of the IClientValidatable interface is to let you extend your server-side DataAnnotations with client-side functions in ASP.NET MVC 3. For instance, a Data Annotation that ensured that a ...

Microsoft's ASP.NET technology showcased Web forms, server-side controls, handling of events generated by Web UI components at the server side, and powerful yet easy-to-use validation controls.