public class MongoConnector
   {
       public class BaseEntry
       {
           public BaseEntry()
           {
               Id = Guid.NewGuid();
           }
           public Guid Id { get; set; }
       }
       public class AnotherEntry : BaseEntry
       {
           public String Info { get; set; }
       }
       public class HelpEntry : BaseEntry
       {
           public String Help { get; set; }
       }
       public class LessDataEntry : BaseEntry
       {
           public String Name { get; set; }
       }
       public class AlotOfDataEntry : LessDataEntry
       {
           public List<int> DetailData { get; set; }
       }
       public void Do()
       {
           BsonClassMap.RegisterClassMap<BaseEntry>(cm =>
           {
               cm.AutoMap();
               cm.SetIsRootClass(true);
               cm.AddKnownType(typeof(LessDataEntry));
               cm.AddKnownType(typeof(AlotOfDataEntry));
               cm.AddKnownType(typeof(AnotherEntry));
               cm.AddKnownType(typeof(HelpEntry));
           });
           AlotOfDataEntry aode = new AlotOfDataEntry() { Name = "AnyName",DetailData=new List<int>() };
 
           for (int i = 0; i < 100000; i++)
               aode.DetailData.Add(i);
 
           var db = new MongoClient("mongodb://localhost/").GetDatabase("Test");
           var collection = db.GetCollection<AlotOfDataEntry>("testCollection");
           collection.InsertOne(aode);
 
           // Get Data as LessDataEntry  will return AlotOfDataEntris
           var collectionLess = db.GetCollection<LessDataEntry>("testCollection");
 
           List<LessDataEntry> list = collectionLess.AsQueryable<LessDataEntry>().OfType<LessDataEntry>().ToList();
 
           db.DropCollection("testCollection");
 
           foreach (var entry in list)
               System.Console.WriteLine(entry.GetType().FullName);
 
       }
   }