How to handle the new ConnectAsync API (C# Neo4jClient)

I updated the Neo4JClient to the version 4.x which included refactoring from client.Connect(); to client.ConnectAsync(). The controller which connects to neo4j is getting instantiated when a request to the api is made, so there is not much time between connecting and using the connection. The async connecting so my guess runs me in the problem, that the client is not connected when I'm already making database requests. I tried to fix this with awaiting the ResultsAsync which didn't fix the problem. Currently there is no documentation existing since it's outdated. Here is my Code :

        // The client is getting injected from my server
        public MyService(GraphClient client)
        {
            this.client = client;
            this.client.ConnectAsync();
        }

        public async Task<bool> Login(string username, string password)
        {
            var query = client.Cypher
                .Match("(n)")
                .Where("n.username = '" + username + "' AND n.password = '" + password + "'")
                .Return(n => n.As<User>());

            var queryResult = await query.ResultsAsync;
            return queryResult.ToList().Count == 1;
        }