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

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

    using MongoDB.Driver;

    public class DemoManager
    {
        #region Constants and Fields

        private readonly IMongoCollection<ClubMember> collection;
        private readonly Dictionary<int, Tuple<IDemo, string>> DemoDictionary;
        #endregion

        #region Constructors and Destructors

        public DemoManager(IMongoCollection<ClubMember> collection)
        {
            this.collection = collection;
            DemoDictionary = new Dictionary<int, Tuple<IDemo,string>>() {
                { 1,Tuple.Create<IDemo,string>(new AggregationDemo(),"Aggregation Demo") },
                { 2,Tuple.Create<IDemo,string>(new GridFSDemo(),"GridFS Demo") },
                { 3,Tuple.Create<IDemo,string>(new LinqDemo(),"Linq Demo") },
                { 4,Tuple.Create<IDemo,string>(new MapreduceDemo(),"Map Reduce Demo") }
            };
        }

        #endregion

        #region Public Methods and Operators

        public async Task<bool> PromptNextDemoAsync()
        {
            Console.WriteLine("Menu");
            foreach (KeyValuePair<int,Tuple<IDemo, string>> entry in DemoDictionary)
            {
                Console.WriteLine($"({entry.Key}) {entry.Value.Item2} ");
            }
            Console.WriteLine($"({DemoDictionary.Count+1}) Exit ");
            int choice=   ConsoleHelper.GetNumberFromUser("Enter Menu choice",1,DemoDictionary.Count+1);
            if (choice != DemoDictionary.Count + 1)
            {
               await DemoDictionary[choice].Item1.RunDemoAsync(collection);
                return true;
            }
            return false;
         
        }

        #endregion
    }
}