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

namespace TestMongo
{
    using System;

    using MongoDB.Driver;
    using MongoDB.Driver.Builders;

    public partial class Program
    {
        #region Methods

        private static void Main()
        {
          
            // const string connectionString = "mongodb://myUserName:MyPassword@linus.mongohq.com:myPortNumber/";
            const string connectionString = "mongodb://localhost/?replicaSet=myReplSet&readPreference=primary";
           // const string connectionString = "mongodb://localhost";
          
            // Create a MongoClient object by using the connection string
            var client = new MongoClient(connectionString);

            //Use the MongoClient to access the server
            MongoServer server = client.GetServer();

            // Use the server to access the 'test' database
            MongoDatabase database = server.GetDatabase("test");
     
            //Builds new Collection if 'entities' is not found
            MongoCollection<ClubMember> collection = database.GetCollection<ClubMember>("entities");

            long count = collection.Count();

            var random = new Random();
            if (count == 0)
            {
                Console.WriteLine("Collection is empty.");
                Console.WriteLine("Enter the number of people to add");

                string ans = Console.ReadLine();
                int counter;
                int.TryParse(ans, out counter);
                Console.WriteLine("Adding {0} new ClubMembers", counter);

                BuildClubMembers(collection, random, counter);
            }
            else
            {
                Console.WriteLine("Number of ClubMembers in Collection {0}", count);
            }

            //Build an index if it is not already built
            IndexKeysBuilder keys = IndexKeys.Ascending("Lastname", "Forename").Descending("Age");
           
            //Add an optional name- useful for admin
            IndexOptionsBuilder options = IndexOptions.SetName("myIndex");
          
            //This locks the database while the index is being built
            collection.EnsureIndex(keys, options);

            Console.WriteLine("List of ClubMembers in collection ...");
            MongoCursor<ClubMember> members = collection.FindAll();
            foreach (ClubMember clubMember in members)
            {
                clubMember.PrintDetailsToScreen();
            }

            DemoLinq(collection);
            DemoQueryBuilder(server,database,collection);
            DemoAggregation(collection);
            DemoMapReduce(collection);
            DemoGridFS(database);


            Console.WriteLine("Press return key to exit or");
            Console.WriteLine("enter 'yes' to empty the Database and exit");
            string emptyDb = Console.ReadLine();
            if (emptyDb == "yes")
            {
                collection.RemoveAll();
            }
        }

        #endregion
    }
}