title: How to sendKeys in textBox? for automation
body: <p>I'm doing a test on c# with selenium for this site <a href="http://onliner.by" rel="nofollow noreferrer">http://onliner.by</a>.
  At first I have to be authorized on this site.</p>
  
  <p>I found(by xpath) button with name"Вход" in the right upper corner and click on it.</p>
  
  <p>Then there's refreshed and page changed, but the link remained the same (<a href="http://onliner.by" rel="nofollow noreferrer">http://onliner.by</a>).</p>
  
  <p>And I need to enter login and password on this page and sumbit it. But I cannot do it.
  I founded Xpath paths of this elements and I used this code:</p>
  
  <pre><code>//this doesn't work
  driver.FindElement(By.XPath("//*[@id='auth-container__forms']/div/div[2]/form/div[1]/div[1]/input")).SendKeys("user");
  driver.FindElement(By.XPath("//*[@id='auth-container__forms']/div/div[2]/form/div[1]/div[2]/input")).SendKeys("password");
  driver.FindElement(By.XPath("//*[@id='auth-container__forms']/div/div[2]/form/div[3]/div/button")).Click();
  </code></pre>
  
  <p>How can I do it? I tried to use SwitchTo().Frame but it didn't help too.</p>
  
  <p>I will be very grateful for help.</p>
  
  <p><a href="https://i.stack.imgur.com/JQcEg.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/JQcEg.jpg" alt="Image explanation what I need"></a></p>