AutoIT : How to use AutoIt selenium c#

1. IWebDriver driver = new InternetExplorerDriver();  
2. driver.Navigate().GoToUrl("http://localhost/Home/StephenSecrets");  
3. //Thread.Sleep(500); //if required  
4. AutoItX.WinWaitActive("Windows Security");  
5. AutoItX.ControlSetText("Windows Security", "", "Edit1", "TestUser"); //replace testuser with actual username (with domain if required)  
6. AutoItX.ControlSetText("Windows Security", "", "Edit2", "Password_test"); //replace Password_test with actual Password  
7. AutoItX.Send("{ENTER}");