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    public object Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
    {
   
        var obj = Activator.CreateInstance(ValueType);

        context.Reader.ReadStartDocument();
      //  bsonReader.ReadStartDocument();

        while (context.Reader.ReadBsonType() != BsonType.EndOfDocument)
        {
            var name = context.Reader.ReadName();

            var field = ValueType.GetField(name);
            if (field != null)
            {
                var value = BsonSerializer.Deserialize(context.Reader, field.FieldType);
                field.SetValue(obj, value);
            }

            var prop = ValueType.GetProperty(name);
            if (prop != null)
            {
                var value = BsonSerializer.Deserialize(context.Reader, prop.PropertyType);
                prop.SetValue(obj, value, null);
            }
        }

        context.Reader.ReadEndDocument();

        return obj;
    }

    public void Serialize(BsonSerializationContext context, BsonSerializationArgs args, object value)
    {
        var fields = args.NominalType.GetFields(BindingFlags.Instance | BindingFlags.Public);
        var propsAll = args.NominalType.GetProperties(BindingFlags.Instance | BindingFlags.Public);

        var props = new List<PropertyInfo>();
        foreach (var prop in propsAll)
        {
            if (prop.CanWrite)
            {
                props.Add(prop);
            }
        }
       
        context.Writer.WriteStartDocument();

        foreach (var field in fields)
        {
            if (field.IsDefined(typeof(MongoDB.Bson.Serialization.Attributes.BsonIgnoreAttribute)))
                continue;
            context.Writer.WriteName(field.Name);
            BsonSerializer.Serialize(context.Writer, field.FieldType, field.GetValue(value));
        }
        foreach (var prop in props)
        {
            if (prop.IsDefined(typeof(MongoDB.Bson.Serialization.Attributes.BsonIgnoreAttribute)))
                continue;
            context.Writer.WriteName(prop.Name);
            BsonSerializer.Serialize(context.Writer, prop.PropertyType, prop.GetValue(value));
        }

        context.Writer.WriteEndDocument();
    }
}