InvoiceModel.cs

using System;
using System.Collections.Generic;

namespace QuestPDF.ExampleInvoice
{
    public class InvoiceModel
    {
        public int InvoiceNumber { get; set; }
        public DateTime IssueDate { get; set; }
        public DateTime DueDate { get; set; }
        
        public Address SellerAddress { get; set; }
        public Address CustomerAddress { get; set; }
        
        public List<OrderItem> Items { get; set; }
        public string Comments { get; set; }
    }
    
    public class OrderItem
    {
        public string Name { get; set; }
        public decimal Price { get; set; }
        public int Quantity { get; set; }
    }

    public class Address
    {
        public string CompanyName { get; set; }
        public string Street { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public string Email { get; set; }
        public string Phone { get; set; }
    }
}