C # Selenium - how to detect that authentication has been successful

How can I know when the authentication is successful after passing the username and password?

I would like to stop the execution and show once the connection was successful.

This is my code?

driver.Navigate().GoToUrl("MiURL");
var wait = new WebDriverWait(driver, TimeSpan.FromSeconds(20));   

List<string> matchingLinks = new List<string>();

IWebElement username = driver.FindElement(By.Name("test"));
userName.SendKeys(c);
IWebElement passwword = driver.FindElement(By.Name("test123"));
userPass.SendKeys(c);
userPass.Submit();