MongoDB authentication with C#

using System;
using System.Diagnostics;
using MongoDB.Bson;
using MongoDB.Driver;

namespace mdbtest
{
    class Program
    {
        static void Main(string[] args)
        {
            var watch = new Stopwatch();
            try
            {
                var client = new MongoClient("mongodb://admin:password@localhost/admin");
                var db = client.GetDatabase("admin");
                watch.Start();
                var result = db.ListCollectionsAsync().Result.ToBsonDocument();
                Console.WriteLine(result.ToString());
            }
            catch (Exception e)
            {
                Console.WriteLine(e.InnerException.Message.Substring(0, 79));
            }
            Console.WriteLine("done in {0} ms!", watch.ElapsedMilliseconds);
        }
    }
}