Beginners' guide to using MongoDB 4.0.2 and the official C# driver

namespace MongoDBDemoAsync
{
    using System;
    using System.Threading.Tasks;

    using MongoDB.Bson;
    using MongoDB.Driver;
    using MongoDBDemoAsync.Classes;

    internal class Program
    {
        #region Public Methods and Operators

        public static void Main()
        {
            Console.WriteLine("****Running on UI type SynchronizationContext****\n");
            var syncContext = new SingleThreadSynchronizationContext();
            syncContext.Run(MainAsync);
            //The thread does not return here until MainAsync's continuation has finished
        }

        #endregion

        #region Methods

        private static async Task MainAsync()
        {
            const string connectionString = Constants.ConnectionString;
            //const string connectionString = Constants.ReplicaSetConnectionString;
            var client = new MongoClient(connectionString);

            // Use the client to access the 'TestMongoDB' database
            IMongoDatabase database = client.GetDatabase(Constants.DatebaseName);
            IMongoCollection<ClubMember> carClubCollection = database.GetCollection<ClubMember>(Constants.CarClubCollection);
            var mapReduceCollection = database.GetCollection<BsonDocument>(Constants.MapReduceCollection);
            var demoManager = new DemoManager(carClubCollection);
            long count = await carClubCollection.CountDocumentsAsync(new BsonDocument());
            if (count == 0)
            {
                Console.WriteLine("About to add new  club members to the database");
                count = ConsoleHelper.GetNumberFromUser("Enter total number of club members", Constants.MinimumMembership, Constants.MaximumMembership);
                var clubMembersBuilder = new ClubMembersBuilder();
                Console.WriteLine($"Adding {count} new ClubMembers");
                await clubMembersBuilder.BuildClubMembersAsync(carClubCollection, count);
            }
            else
            {
                Console.WriteLine($"Number of ClubMembers in Collection {count}");
            }
            //Build an index if it is not already built
            IndexKeysDefinition<ClubMember> keys =
                Builders<ClubMember>.IndexKeys.Ascending("Lastname").Ascending("Forename").Descending("Age");
            //Add an optional name- useful for admin
            var options = new CreateIndexOptions { Name = Constants.IndexName };
            var indexModel = new CreateIndexModel<ClubMember>(keys, options);
            await carClubCollection.Indexes.CreateOneAsync(indexModel);
            bool isContinue = true;
            while (isContinue)
            {
                isContinue = await demoManager.PromptNextDemoAsync();
            }
            Console.WriteLine("Please press the return key to empty the collections and exit ");
            Console.ReadLine();
            var emptyFilter = new BsonDocument();
            await carClubCollection.DeleteManyAsync(emptyFilter);
            await mapReduceCollection.DeleteManyAsync(emptyFilter);
            //  database.DropCollection(Constants.MapReduceCollection);
            // database.DropCollection(Constants.CarClubCollection);
        }

        #endregion
    }
}