diff --git a/chap3_your_first_mvc_app/PartyInvites/Models/GuestResponse.cs b/chap3_your_first_mvc_app/PartyInvites/Models/GuestResponse.cs
index c91944f..bb7423c 100644
--- a/chap3_your_first_mvc_app/PartyInvites/Models/GuestResponse.cs
+++ b/chap3_your_first_mvc_app/PartyInvites/Models/GuestResponse.cs
@@ -1,10 +1,22 @@
-namespace PartyInvites.Models
+using System.ComponentModel.DataAnnotations;
+
+namespace PartyInvites.Models
 {
     public class GuestResponse
     {
+        [Required(ErrorMessage = "Please enter your name")]
         public string Name { get; set; }
+        
+        [Required(ErrorMessage = "Please enter your email address")]
+        [RegularExpression(".+\\@.+\\..+", 
+            ErrorMessage = "Please enter a valid email address")]
         public string Email { get; set; }
+        
+        [Required(ErrorMessage = "Please enter your name")] 
         public string Phone { get; set; }
+        
+        [Required(ErrorMessage = "Please specify whether you'll attend")]
         public bool? WillAttend { get; set; }
+        
     }
 }
\ No newline at end of file