medium-2016-09-22.cs

using System.ComponentModel.DataAnnotations;

public class Category
{
    private Category()
    {
    }
    
    public Category(string name)
    {
        SetName(name);
    }
    
    public int Id { get; set; }
    
    [Required]
    [StringLength(50)]
    public string Name { get; private set; }
    
    public void SetName(string name)
    {
        Name = name;
    }
}

public class Task
{
    private Task()
    {
    }
    
    public Task(string description, Category category)
    {
        SetDetails(description, category);
    }
    
    public int Id { get; set; }
    
    [Required]
    [StringLength(500)]
    public string Description { get; private set; }
    
    public bool IsComplete { get; private set; }
    
    [Required]
    public Category Category { get; private set; }
    
    public void SetDetails(string description, Category category)
    {
        Description = description;
        Category = category;
    }
    
    public void MarkComplete()
    {
        IsComplete = true;
    }
    
    public void MarkIncomplete()
    {
        IsComplete = false;
    }
}