update by incrementing field

Program.cs

using MongoDB.Entities; //https://mongodb-entities.com
using System;
using System.Threading.Tasks;

namespace TestApplication
{
    public class Message : Entity
    {
        public string Content { get; set; }
        public int Upvotes { get; set; }
    }

    public static class Program
    {
        private static async Task Main()
        {
            await DB.InitAsync("test");

            var msg = new Message { Content = "hellow world", Upvotes = 0 };
            await msg.SaveAsync();

            await DB.Update<Message>()
                    .Match(m => m.ID == msg.ID)
                    .Modify(b => b.Inc(m => m.Upvotes, 1))
                    .ExecuteAsync();

            var res =await  DB.Find<Message>()
                              .Match(m => m.ID == msg.ID)
                              .ExecuteAsync();

            Console.WriteLine("Upvotes: " + res[0].Upvotes.ToString());
            Console.ReadLine();
        }
    }
}