Godot attempt to connect to MongoDb using c# nuget package

Mongo.cs

using Godot;
using System;
using MongoDB.Driver;
using MongoDB.Bson.Serialization.Attributes;
using MongoDB.Driver.Core.Clusters;

public class Mongo : Node
{
    MongoCRUD db = new MongoCRUD("testDb");    // MongoDb will get ths database if available, if not it will create it.

    public override void _Ready()
    {
        PersonModel person = new PersonModel
        {
            FirstName = "Chris",
            LastName = "Findlay"
        };

        db.InsertRecord("Users", person);
    }
}

public class MongoCRUD
{
    private IMongoDatabase db;
    private MongoClient client;
    private String ConnectionString = "mongodb://localhost:27017/";

    public MongoCRUD(string database)
    {
        client = new MongoClient(ConnectionString);
        //client = new MongoClient();         
        db = client.GetDatabase(database);
    }

    public void InsertRecord<T>(string collectionName, T document)
    {
        IsDatabaseIsConnected(client);
        var collection = db.GetCollection<T>(collectionName);
        
        GD.Print("Inserting PersonModel");
        try
        {
            collection.InsertOne(document);
            GD.Print("Record Inserted");
        }
        catch(Exception e)
        {
            GD.Print("Failed to insertOne()");
            //GD.Print(e);
        }
    }

    public bool IsDatabaseIsConnected(MongoClient client)
    {
        bool isMongoLive = client.Cluster.Description.State == ClusterState.Connected;
        if(isMongoLive)
        {
            GD.Print("connected");
            return true;
        }
        else
        {
            GD.Print("not connected");
            return false;
        }
    }
}

class PersonModel
{
    [BsonId]    // _id
    public Guid Id {get; set;}
    public string FirstName { get; set; }
    public string LastName { get; set; }
}