How to test an autocomplete address in Selenium C# driver?

 //Define Search Address
        [FindsBy(How = How.Id, Using = "autocomplete")]
        private IWebElement SearchAddress { get; set; }

// Send value in Search Address
SearchAddress.SendKeys("223 Mount Eden Road, Mount Eden, Auckland");
            Thread.Sleep(1000);
            SearchAddress.SendKeys(Keys.Down);
            SearchAddress.SendKeys(Keys.Enter);