C# MongoDB insert new object to List

I'm new to both C# and MongoDB. I'm trying to add a new object to a list in a MongoDB collection, here is my code:

ProjectModel:

class ProjectModel  {      [BsonId]      public Guid Id { get; set; }      public string ProjectNumber { get; set; }      public string ProjectName { get; set; }      public PartModel[] Parts { get; set; }  }  

PartModel:

class PartModel  {      public string PartNumber { get; set; }      public string PartName { get; set; }  }  

Method Class

class MongoCRUD  {      private IMongoDatabase db;            public MongoCRUD(string database)      {          var client = new MongoClient();          db = client.GetDatabase(database);      }        public void InsertPart<T>(string table,  Guid id, PartModel newPart)      {                 var collection = db.GetCollection<T>(table);          var filter = Builders<T>.Filter.Eq("Id", id);                    var update = Builders<ProjectModel>.Update.Push<PartModel>(e => e.Parts, newPart);      }  }  

Main Class:

class Program  {      static void Main(string[] args)      {          MongoCRUD db = new MongoCRUD("PartsManagerDB");            PartModel newPart = new PartModel()          {              PartName = "Lower Bracket",              PartNumber = "4000"            };            db.InsertPart<PartModel>("Projects", new Guid("f3784ba4-c422-43e0-80fd-41bb87b20f10"), newPart);      }  }  

The project 93100 is already in my db, but after executing my code, no error comes up but the collection is not being updated as you can see below:

https://stackoverflow.com/questions/65534515/c-sharp-mongodb-insert-new-object-to-list January 02, 2021 at 07:08AM