gistfile1.cs

using System;

using MongoDB.Bson;
using MongoDB.Bson.DefaultSerializer;
using MongoDB.Bson.IO;
using MongoDB.Bson.Serialization;
using MongoDB.Driver;
using MongoDB.Driver.Builders;

namespace ConsoleApplication1 {
    public class Model {
        public String Id { get; set; }
        public string Name { get; set; }
        public DateTime DateTimeProperty { get; set; }
    }

    public static class Program {
        public static void Main(string[] args) {
            // serialization configuration must be done before starting to use MongoDB
            var localTimeOption = new DateTimeSerializationOptions { Kind = DateTimeKind.Local };
            BsonClassMap.RegisterClassMap<Model>(cm => {
                cm.MapIdProperty(c => c.Id);
                cm.MapProperty(c => c.Name);
                cm.MapProperty(c => c.DateTimeProperty)
                    .SetSerializationOptions(localTimeOption);
            });

            var server = MongoServer.Create();
            var database = server["test"];
            var collection = database.GetCollection<Model>("model"); // default document type is Model
            collection.RemoveAll();

            var m1 = new Model {
                Id = Guid.NewGuid().ToString(),
                DateTimeProperty = DateTime.Now,
                Name = "test"
            };
            collection.Save(m1);

            var query = Query.EQ("_id", m1.Id);
            var m2 = collection.FindOne(query);

            if (m1.DateTimeProperty.ToShortTimeString() != m2.DateTimeProperty.ToShortTimeString())
                throw new Exception();
        }
    }
}