/ThinkEmailFomatter/Models/DataObjects/DomainObjects/TemplateSetting.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;

namespace ThinkEmailFormatter.Models
{
    public class TemplateSetting : IIdentifiable
    {
        public int Id { get; set; }

        public Guid Guid { get; set; }

        [Required]
        public string Name { get; set; }

        [StringLength(1024)]
        [DataType(DataType.MultilineText)]
        public string Description { get; set; }

        public bool Flag { get; set; }

        [DisplayName("From email")]
        public string FromEmail { get; set; }

        public string Subject { get; set; }

        [DisplayName("Event Type")]
        [Required]
        public Identifier EventType { get; set; }

        [DisplayName("Order Class")]
        [Required]
        public Identifier OrderClass { get; set; }

        [DisplayName("Enable default template")]
        public bool DefaultEnabled { get; set; }

        [DisplayName("Enable Tax Invoice check")]
        public bool TaxInvoiceCheckEnabled { get; set; }

        public List<Filter> Filters { get; set; }

        /// <summary>
        /// Initialize instances marked as "Required" so they are not null.
        /// It removes the need to check if the instance is not null in 
        /// the view, and also removes the need to create the instance
        /// before setting it.
        /// </summary>
        public void InitiateRequiredComplexTypes()
        {
            if (this.OrderClass == null)
                OrderClass = new Identifier();

            if (this.EventType == null)
                EventType = new Identifier();
        }
    }

    public class Identifier : IIdentifiable
    {

        public int Id { get; set; }

        public Guid Guid { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }

        public bool Flag { get; set; }
    }

    public class Filter : IIdentifiable
    {
        public int Id { get; set; }

        public Guid Guid { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }

        public bool Flag { get; set; }

        public Identifier OrderCode { get; set; }

        public Identifier SourceCode { get; set; }

        public Identifier SubscriptionDefinition { get; set; }

        public bool Active { get; set; }
    }
}