mycorerepository/MyCore/Models/WidgetNews.cs

using MongoDB.Bson.Serialization.Attributes;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace MyCore.Models
{
    public class WidgetNews : Widget
    {
        [BsonElement("Country")]
        public string Country { get; set; }

        [BsonElement("Provider")]
        public string Provider { get; set; }

        [BsonElement("Speed")]
        public string Speed { get; set; } // Or int ? 
    }
}