MainMethod.cs

static void Main(string[] args)
        {
            IMongoCollection<Person> collection = InitializeDatabase();

            if (args[0] == "Add")
            {
                AddCustomer(collection);
            }
            else if (args[0] == "List")
            {
                string customerid = args[1];
                Int32.TryParse(customerid, out int id);
                FindCustomer(collection, id);
            }
            else if (args[0] == "Delete")
            {
                string customerid = args[1];
                Int32.TryParse(customerid, out int id);
                DeleteCustomer(collection, id);
            }
            else if (args[0] == "Update")
            {
                string customerid = args[1];
                Int32.TryParse(customerid, out int id);
                string field = args[2];
                string renamed = args[3];
                UpdateRename(collection,id,field,renamed);
            } 
        }