Add project files.

Models/ContactFormModel.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace clivelancaster.Models
+{
+    public class ContactFormModel
+    {
+        [Required]
+        [Display(Name = "Your Name")]
+        public required string Name { get; set; }
+
+        [Required]
+        [EmailAddress]
+        [Display(Name = "Your Email")]
+        public required string Email { get; set; }
+
+        [Required]
+        [Display(Name = "Subject")]
+        public required string Subject { get; set; }
+
+        [Required]
+        [Display(Name = "Message")]
+        public required string Message { get; set; }
+    }
+}

Models/ErrorViewModel.cs

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+namespace clivelancaster.Models
+{
+    public class ErrorViewModel
+    {
+        public string? RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+    }
+}

Models/SubscribeFormModel.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace clivelancaster.Models
+{
+    public class SubscribeFormModel
+    {
+        [Key]
+        public int id { get; set; }
+
+        [Required]
+        [EmailAddress]
+        [StringLength(255)]
+        public required string email { get; set; }
+
+        [Required]
+        public DateTime datesubscribed { get; set; } = DateTime.Now;
+    }
+}