i am using C# library for FB Messenger API here - https://www.nuget.org/packages/facebook-messenger-net-lib/

But i think there is lack of some documentation . i am trying below code to send message but message is not delivering . Token I am using is Page Access Token generated from Graph api explorer tools.

Code I am trying ( Console Application Code )

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using FacebookMessengerLib;
namespace FmAPI
{
    class Program
    {
        static void Main(string[] args)
        {
            MessengerAPI obj = new MessengerAPI("EAACEdEose0cBAOSSBMZAZCd2OTZBT95ZBQbdd69B4eRbWcrWFdZAvUOrnk57DrnaHZARh3lIgZBGxzolZAMjQry9fiZCFjFzQEJJElZATgzTIQB3HsTZCyaimLzeetd37LhTG3yhwfGlxE7ojtdnupopsN3s1ZAzSgQPuxSsgf56MqpJPwZDZD");
            obj.SendTextMessageAsync(660746514005471, "Hello");
        }
    }
}