made a demo so its a all in one drop in as of unity 2019.4.0f1

thank you

Model_Upload.cs

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+using MongoDB.Driver;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class Model_Upload : MonoBehaviour
+{
+    private const string MONGO_URI = "mongodb://127.0.0.1:27017";
+    private const string DATABASE_NAME = "testDatabase";
+    private MongoClient client;
+    private IMongoDatabase db;
+
+    void Start()
+    {
+        client = new MongoClient(MONGO_URI);
+        db = client.GetDatabase(DATABASE_NAME);
+        IMongoCollection<Model_User> userCollection = db.GetCollection<Model_User>("collectionName");
+        Model_User e = new Model_User();
+        e.name = "hope";
+        userCollection.InsertOne(e);
+        List<Model_User> userModelList = userCollection.Find(user => true).ToList();
+        Model_User[] userAsap= userModelList.ToArray();
+        foreach(Model_User asap in userAsap)
+        {
+            print(asap.name);
+        }
+    }
+
+
+}

Model_User.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using MongoDB.Driver;
+using MongoDB.Bson;
+// Model_User Sample
+public class Model_User
+{
+    public ObjectId _id { set; get; }
+    public string name { set; get; }
+
+    public int ActiveConnection { set; get; }
+    public string Username { private set; get; }
+    public string Email { private set; get; }
+    public string ShaPassword { private set; get; }
+
+    //Possible Methods ...
+}