MARCAR NO NA TREEVIEW

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace TreeViewExample
{


    public partial class Form1 : Form
    {

        class Permission
        {
            public string Id { get; set; }
            public string Description { get; set; }

            internal Permission(string id, string description)
            {
                this.Id = id;
                this.Description = description;
            }
        }

        class User
        {
            public string Name { get; set; }
            public IList<Permission> Permissions { get; set; }

            public User(string name)
            {
                this.Name = name;
            }

        }

        class DummyDatabase
        {
            public IList<User> Users { get; private set; }
            public IList<Permission> Permissions { get; private set; }

            internal DummyDatabase()
            {
                this.Permissions = CreatePermissions();
                this.Users = CreateUsers();

            }

            private IList<Permission> CreatePermissions()
            {
                return new List<Permission>()
            {
                new Permission("Customer.CanEdit", "Allow to edit a customer"),
                new Permission("Customer.CanDelete", "Allow to delete a customer"),
                new Permission("Customer.CanInsert", "Allow to insert a customer"),
                new Permission("Customer.CanView", "Allow to view a customer")
            };
            }

            private IList<User> CreateUsers()
            {
                return new List<User>()
            {
                new User("Gohan")
                {
                    Permissions = new List<Permission>()
                    {
                        this.Permissions.First(permission => permission.Id == "Customer.CanEdit"),
                        this.Permissions.First(permission => permission.Id == "Customer.CanView")
                    }
                }
            };
            }

        }


        private readonly DummyDatabase _database = new DummyDatabase();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.LoadAllPermissions();
            this.CheckUserPermissions(userName: "Gohan");
        }

        private void LoadAllPermissions()
        {
            foreach(Permission permission in _database.Permissions)
                treeView1.Nodes.Add(key: permission.Id, text: permission.Description);
        }

        private void CheckUserPermissions(string userName)
        {
            User user = this._database.Users.First(u => u.Name == userName);

            foreach(Permission userPermission in user.Permissions)
            {
                TreeNode node = treeView1.Nodes.Find(userPermission.Id, searchAllChildren: true).First();
                node.Checked = true;
            }
        }

    }
}